Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. Some cases may look identical and have a different casting number but have the same GM part number. 10. This case was used to the end of 1967. Its identical tothe 3831704, except it had a biggerfront bearing bore. Fair Price. It was much easier to stockpile Muncie spare parts and cores in the 1970s than it is today. The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74. The bearing retainer slips over the input shaft and seals the transmission from the front. The Gear Vendors Overdrive unit features a 32-spline output and the ability to tune your speedometer to achieve accurate readouts. For example, P0101 indicates January 1. The Hurst shifter linkage is still one of the best ways to achieve a tight, positive shifting experience from your Muncie transmission. AG Roller Side Cover. Fully lubricate the detent levers and side arms with assembly lube. I learned from speaking to many builders that the rare 3864848 case seems to be in a few Corvettes and full-size GM cars with big-block engines. 1- Set of French Locks. 11. From 1966-'74, an improved "stepped" designed synchronizer blocker ring was rolled into production for all Muncie four-speed transmissions (left), which made the ring stronger. But the most important tools you have are not in your toolbox. Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions. Creators of the JT5 Jaguar 5 Speed, new heavy duty M22 Muncie transmissions, rebuild kits for the Muncie, Super T10, T5 and Ford Toploader, books and Youtube videos. Notice their circled Wlogo. Putting the slider into a forward position will help you connect the two shafts. (Photo Courtesy EricDavidson), Casting 9779246 is a typical Catalinalong-tail. Side-by-side are the two countershaft support sizes, which are 7/8-inch (left) and 1.000-inch (right). (Coincidentally, March 1965 seems to be a time when the 396 engine started to migrate into more vehicles, such as Z16 Chevelles, Corvettes, and full-size Impalas.) Email Seller Video Chat. 11. The mid plate is aircraft grade aluminum. Muncie Models ( For Reference Only) Because date-coded serial numbers and VINs were only stamped (not cast) into the main case, the main case should be your starting point. By changing the ratio of just the head set (input shaft and front of the countergear) you can change the overall ratio. It was used primarily with the 26-spline input shaft and larger 32-spline output-shaft models, so it appears that they were looking to optimize strength everywhere possible since the 454 engine was introduced in 1970. straight-cut design. 1 - 24 of 181,172 used cars. And finally, if forced to choose between a Muncie or the BorgWarner T-10, it is suggested you choose the Muncie due to its brute strength. 3. The M21 & M22 is a four speed, RWD or 4WD transmission. Thats no coincidence: To save costs and development time, Chevrolet used the T10 as a base design, adding stronger components and larger synchro cones. This early type is onlyfound in 1963 transmissions. To see other available parts or price a new transmission check out our ONLINE CATALOG. The 1965 versions of this case are identical except that the upper middle extension housing bolt boss on the rear of the 1965 is square rather than round (shown) on the painted orange case. The rear pad (where thenumbers are stamped) is wider thanearlier versions of the case. When you have the two side-by-side it becomes obvious which is which. These guys stockpiled a lot of parts! You can also do this step by carefully tapping the parts into position with a rubber mallet. These cases were obviously repaired but sometimes a replacement case was the only fix. The cases offer a broad range of interchangeability. The assembly date ofP9P16A translates to September 16,1969. Glean the basics and use them in your research. This is the first version of the 3831752cast midplate. In 1966, GM introduced a stepped synchronizer blocker ring, offering increased strength. C $52.12 + C $78.60 shipping. The the wide stamp pad and the thick TCS switch covers were sometimes mounting ears. Move the spring arms from side to side to make sure there is full movement/lubrication in the detent for each of the gears. Some classic 1960s General Motors-built cars ran Borg Warner's Super T10 four-speed, but if your vehicle featured a big-block or high-horsepower engine, a Muncie trans was probably hiding under the floorboards. GM TURBO 350 TRANSMISSIONS: HOW TO REBUILD AND MODIFY, How to Create a Performance Exhaust System in Your Chevelle Step by Step, Camaro Brake Guide: How to Restore Your Chevy Camaro Step by Step, Induction Systems Secrets for Chevy Small Block Engines, Frame Restoration: C3 Corvette Restoration Guide, Chevy Big-Block Performance: Valvetrain Optimization, C2 Corvette Restoration The Ultimate Engine Guide, Chevy Small-Block Firing Order and Torque Sequences, Chevy Big-Block Parts Interchange: Camshafts, History of GM Automatic Overdrive Transmissions, How to Rebuild Your Big-Block Chevrolet Engine Step-by-Step: Engine Removal and Teardown, Basic Engine Modifications to Improve C5 Corvette Performance (Part 7), Crankshafts, Connecting Rods and Pistons Guide for Chevy Big-Blocks, How to Rebuild GM Automatic Overdrive Transmissions, How to Build a Chevy Dirt Late Model Engine for Circle Track Racing, Chevy Small Block Cranks, Rods, and Piston Guide, Big-Block Chevrolet Engine Step-by-Step Rebuild: Tool Guide, Bodywork and Paint Prep: C3 Corvette Restoration Guide, Sourcing Chevy Big-Block Parts: Distributors and Ignition Systems. Main cases manufactured prior to May 7, 1963, will say Patent Pending. The fact is General Motors couldnt use a standard 6307-style bearing with a width of 21 mm because the gears were already tooled and made. Cangialosi explains there were two basic mainshafts produced for the M20, M21, and M22 transmissions (see Input Shaft Identification chart). Ithas the early non-hat-style pivot pin. Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. The basic design and operation theory of the gearbox changed little during that time, though several design upgrades and modifications were made during the total production run. It uses much the same gear ratios as the close-ratio M-21, but it can handle much more abuse. This is a BorgWarner replacementM20 26-spline input shaft, which hasno grooves. Muncie transmissions also tend to get performance improvements such as a gear ratio change and stronger internal parts. Just because you've found a 26-spline input shaft does not mean you've found an M22 input shaft, which is made of a stronger alloy. This was mold pattern number 1. SPRING SALE!!! Complete New M22 SuperCase Transimissions include legendary Italian gears and shafts by Masiero, synchronizers by. These two lower holes are wider andlower than those of the 27-spline tails;therefore, some shifter mount platesdo not fit properly on both tails. That the Muncie has much in common with the T-10 is no accident. Most transmissions are missing these tags, but if you want to do a complete restoration they are generally necessary. Muncie (General Motors) 4-speed longitudinal transmissions were developed in three distinct models The Muncie M20 wide ratio manual transmission, the Muncie M21 close ratio manual transmission and the Muncie M22 heavy-duty close ratio manual transmission. Early pins were prone tofalling into the transmission. If you have to replace an early 7/8-inch case, a later casting is offered with the thick ears but machined for the early shaft. Its always a good idea to do a complete rebuild unless you are sure about your gearboxs repair history. Casting number revisions are always chronological, which means that a higher number corresponds to a later part. All M22s use a 26-spline shaft made from a stronger alloy than the other 4-speeds. The M22 to come later in 1967-'74 is also a close-ratio unit, but much stronger than the M21, with a higher torque capacity. The 4-speed Muncie came in three versions. The 3864848 case with the last 848 numbers milled off is in some full-size cars, such as the Impala. The mountingears also have thicker gussetsthan earlier cases. Us | Rebuild Kits | Muncie I have a muncie 4 speed M22 for sale has new M22 gear set and rebuild kit new tork locking sliders i want 1950 dollars The shifter is still new with low mile shifts like new to 425. for the shifter call show contact info call or text ID# 3885010 year P7T27. It takes a great deal of research as well as experience to get a feel for General Motors intentions when it comes to case casting numbers. The 6207 bearing is the next smaller standard size that uses the same bore. The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 (see Muncie M20/M21/M22 Main Case Identification chart). Gear ratios are the same as the close-ratio M21. All Items For Sale. This could be an alloy improvement, a casting tool change, or some physical change. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. Contrary to popular belief, you cannot tell a 4-speed Muncie is an M22 by looking at the input shaft splines. If you've ever driven a classic muscle car equipped with a four-speed manual transmission, you probably experienced the joys of commanding a Muncie Rock Crusher. (The M does not stand for "Muncie.") If you've ever looked at a BorgWarner T-10 and a Muncie four-speed and gotten them mixed up, you are not alone because the Muncie (M20, M21, and M22) is a direct descendant of the T-10 according to Cangialosi. A=M20 B=M21, C=M22). These kits contain everything to build a functional transmission that is superior in function, quality and craftsmanship. Muncie transmissions from 1971-'74 have the larger 32-spline output shaft. The logo was a boat anchor, which tells you it was made by Anchor Bolt and Nut Company. View Photos. Having issues diagnosing problems with your M21 M22 4 Speed Muncie Manual Transmission? SPRING SALE!!! This gives a better view of the mainshaft assembly going together. Because the Muncie was really GMs design improvement of the T10, the 7/8-inch-diameter counter-shaft was also used in 1963. Usually a casting number is changed because of a design change. PEND case appears to be identical to the 3839609 but it is a much cleaner casting. Thanks again Jeff, Michael OBrien Early versions were still cast with Patent Pending and a rounded upper extension housing bolt boss. Its also not uncommon to see double stamps or sometimes even double letters at the end. Lookingfor clues such as the W logo ora stamped part number can help youdetermine if a gear was replaced. Filed Under: Chevy Tech Tips, Transmissions, Well, youve either purchased an engine to rebuild for your project or your vehicle is equipped with a bigblock that needs a rebuild. Muncie M20 rebuild kits. Check if this part fits your vehicle. Explore 7 listings for Muncie 4 speed at best prices. It has a seven-digit serial numbercast into the case on the passengersside. RTS / SROD 3 Speed Overdrive Transmission Parts, BW4422, BW4424, BW4462 Transfer Case Parts, BW4484, BW4485, BW4493 Transfer Case Parts, Rebuilt Cadillac CTS-V TR6060 Transmission, Extension Housing Bushing 1.630 OD, 35008, Extension Housing Bushing 2.010 Inch. Muncie Power Products is excited to announce the release of the F22 Series power take-off, designed specifically for Ford's 10R140 Series transmission for model year 2024 Ford F-650 & F-750 diesel trucks. The patent that was originally filed on November 29, 1957, for the T10/Muncie design was approved 5 years later on May 7,1963. What you will find in your search for the right Muncie four-speed is conflicting information from different sources. Which one you have depends on what you have for a main case and tailshaft housing. Each unit starts with a completely new gearset and all internals However, there seems to be a big overlap from 1969 to 1970, with both of these cases. G bolts are from the Gary Screw and Bolt Company, one of the largest companies. 15. Shops like this are a greatplace to research castings and partnumbers. Lets take a look at how the Muncie main case evolved from 1963 to actually going into an early 1968 car. Notice the other lettersand the type of options they represent.Because M21 is just a code, laterCorvettes or other 4-speed cars didnthave Muncies; those equipped with aSuper T10 4-speed could have an M21or an M20 code. Just three types of Muncie 4-speeds are available based on the RPO (regular production option) code used when a car was ordered: the M20 (standard wide-ratio), M21 (close-ratio), and M22 (heavy-duty close-ratio). My experience with MidWest Muncie has been the Best. Camaro, Corvette, Chevelle, Nova. From left to right, early M20, M21, later M20, and M22. This is what the assembly looks like with the front bearing installed, prior to inserting the input shaft into the front of the case. Update on new Muncies transmissions as of January 1st 2022. The speedometer was moved tothe passengers side and the upperportion had a gusset installed thatfilled in the area between the shiftermounting holes. You can copy and paste this link to share: https://www.chevydiy.com/muncie-4-speed-identification-guide/. You need some basic hand tools, some specialty tools, and an engine stand. Remove the side cover and forks for a look at the geartrain. According to Cangialosi, two companies, Borg and Beck and Warner Gear, merged in 1928 to form BorgWarner. By late 1964 the 3851325 case was cast with GM Patent Number 3088336. 20% Cancelation Fee on special order. The headset-driven gear is the countergear front gear with a tooth count of 25. Two types of these midplates were cast. 6. This is generally caused by pilot bearing failure that generally damages the input shaft. These two milled 3864 cases have March 1965 assembly dates. 10 OR 26 spline input and large 27 OR 32 spline output shaft. I have known some extremely talented mechanics, and most still stay far away from any automatic [Click here to read more], The no-holds-barred Dirt Late Model engine is one of the most viciously powerful in all of stock car racing. You can The guys at Anaheim Gear tell us there are seven total Muncie input shaft options. The 26-spline input shaft came into production later in the 1970s for the M20 and M21. AUSTRALIA, Your email address will not be published. To allow the cluster gear to ride with a minimum of friction, a series of roller bearings are slipped inside the cluster gear and held in position with heavy grease before the pin locks it in place. AG Roller It usually begins with 18S101350 or 28N12950. The case countershaft bore usually stretched out so the increase in shaft diameter spread the counter-shaft load over a wider area. The case appears to be identical to a 3851325 case so perhaps it is made of a different aluminum alloy. It has anAugust 7, 1974, build date. Z RATIO (1st-2.984, 2nd-2.043, 3rd-1.468, 4th-1.00), W RATIO (1st-2.559, 2nd-1.752, 3rd-1.366, 4th-1.00) Pair it with a faster axle, say a 3.54 for street or a 4.11 for the strip, X RATIO (1st-2.199, 2nd-1.506, 3rd-1.174, 4th-1.00) For. If it's original to the car it will have some identifying #s on it . 13. Columbia, TN. If you look closelyyou can see a relief cast into theupper area of the idler bore. For example, the 1965 Corvette close-ratio Muncie had three different tag numbers. On the right is the M22 countershaft with 27-teeth. SPRING SALE!!! This is listed as PN-SL24229 from Wright Connection Speed & Gear. High Performance Forged Synchronizer Rings made by Synchroking! units. 18. Product price is not filled in. New Super Heavy Duty Direct Replacement and Strongest M22s Made With Muncie Auto Gear Upgraded Ultra Case and Strongest M22 Close Ratio or Wide Ratio Gears. The M22 has 27 teeth on the countershaft gear, while the M20 and M21 have 29 teeth. GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. Casting numbers are not GM part numbers. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. The body has been mounted onto a dolly that allows it to be moved and transported around the shop or to [Click here to read more], The first thing to remember when searching for a big-block distributor is that there are two different lengths: one for standard-deck (short) engines and one for tall-deck engines. This is an M21 with 10-spline input shaft and cast-iron bearing retainer. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. This is an M21 with 10-spline input shaft and cast-iron bearing retainer. Note that all of the bolts will have to be removed to attach the tailhousing. Feel free to upload pictures and ask questions. The large-bore Muncie came into production in 1964-'65 and became the standard from then on through the end of production in 1974. Muncie four-speeds were produced in two different ratios: the wide ratio (M20) and the close-ratio (M21). Counter Shaft Pin), Small Parts Kit (7/8 OD Counter Shaft) (M20), Small Parts Kit (1 OD Counter Shaft) (M21 M22), Transmission Conversion Kit (Complete) (M21 to M22), Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD), Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD) Max load, 1-2 Synchro Ring (Early, Non-Stepped Shoulder), 1-2 Synchro Ring (Late, Stepped Shoulder), 3-4 Synchro Ring (Early, Non-Stepped Shoulder), 3-4 Synchro Ring (Late, Stepped Shoulder), M20 (10 Spline, 7/8 Counter Shaft) Wide Ratio 2.56 1st Gear, M20 (10 Spline, 1 Counter Shaft) Wide Ratio 2.52 1st Gear, M20 (26 1 Counter Shaft) Wide Ratio 2.42 1st Gear, M21 (10 Spline 7/8 Counter Shaft) Close Ratio 2.20 1st Gear, M21 (10 Spline 1 Counter Shaft) Close Ratio 2.20 1st Gear, M21 (26 Spline 1 Counter Shaft) Close Ratio 2.20 1st Gear, M22 (1st Gear Kit) Updated Incl. This frees up the geartrain. If you have a Muncie dated with a December build date it was actually built the previous year. Certain make and model GM cars used one type while other models used something different. This might have been a different alloy because its appearance is identical to the 3851325 case and it was to be used strictly with the new big-block 396 engine. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. The Muncie case (3831704) replaced the T10 4-speed in the 1963 Chevrolet Bel Air and Corvette by mid-May of that year. 17. Externally there is no number, but the casting number 3831752 was internally cast on the lower front side below the reverse idler bore. The m22 was gone in the Camaro in 72 as you state . SPRING SALE! The clock looks like a mathematical fraction with a 1/2-inch circle around it; they were a way to track any quality-control issues. Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. 10. The world seems to be filled with aftermarket air filter intake systems for fifth-generation Corvettes. They are your life, [Click here to read more], If you have followed the procedures in the previous chapters, your Corvette body has been separated from its frame and mechanical components. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. VIDEO: F22 Series PTO with Quiet . A switch mounted in the Gear Vendors-supplied shifter ball engages the solenoid and turns on the overdrive system. Note the single groove, meaning an M21 close-ratio. The early M20 with the 24-tooth input only came in 10-spline. How to Identify Muncie 4 Speed Transmissions. Serial numbers are stamped into the case. This design creates the distinctive low-RPM rattle and high-RPM whine the Rock Crusher is known for. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. This can add confusion to what you've found. Larry Haynes. Examine the input and output shafts to see if you've found the box you want. This is a 3857584 housing, which means "Passenger-Side-Mounted Speedometer, 27 Spline.". Few things excite like the sound and feel of an old-fashioned Chevrolet muscle car and that familiar whine of a classic Muncie four-speed transmission going through the gears. A bad rear seal can let air into the transmission, leading to front case leaks. Muncies with 26-spline inputs and 32-spline output shafts came as M20, M21, and M22 transmissions. The reverse gears are helical cut and are located in the extension housing. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. Italian gear sets, roller bearing clusters, Heavy Duty shift plate (M23 Super Finish shown) Filter Results: 82 found Show Filter In StockWhile Supplies Last! Not every step is as simple as sliding on the part. In the 1970s, virtually all Muncie four-speeds had 26-spline input shafts. Here's a typical Muncie gearset consisting of First, Second, and Third gear. It is driven by the input shaft with 21 teeth. . Because main cases are often swapped rather than being repaired, the best way to determine if you have an M20, M21, or M22 is to simply look at the gears. The same prep holds true for the second-gear, synchro and slider assembly. Author and technician Paul Cangialosi tells us the original U.S. patent for the Muncie four-speed was filed on November 29, 1957, and approved May 7, 1963. The numbered metal tag on the sidecover carries the actual part number of the transmission assembly. Part No: RSG297-MSSGTK. Main cases manufactured prior to May 7, 1963, will say Patent Pending. Save your search. The cheapest offer starts at $ 3,500. Which one really improves your cars performance? The tailhousing slips on in this manner. When you have the two side-by-side it becomes obvious which is which. Although the Muncie's bloodline goes way back, this legendary gearbox entered service for the Chevrolet Division in 1963. This was eliminated after 1963. Free shipping for many products! The first Muncie copied the smaller bearing and retainer combination of the T10. 19. What you can see is that before March 1965 these cases were not milled. This patent number, according to Cangialosi, can be found cast into most Muncie four-speed main cases. Use Lubriplate 105 on the synchronizer slots. According to Paul Cangialosi, Muncie transmission historian, technician, and author of Muncie 4-Speed Transmissions: How to rebuild and modify, the Muncie four-speed transmission has its roots back to 1935 and the U.S. patent number 3,088,336 along with an engineer named James W. Fodrea. On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. Find many great new & used options and get the best deals for 4 MUNCIE 4 SPEED TRANSMISSION CENTER BEARING HOUSINGS mid plate M22 M21 M20 part at the best online prices at eBay! Here are three rules that will help you determine which transmission you have: Muncie countergears had the same number of teeth on first-, second-, and third-speed sections. The side cover has seven bolts and two shift cams. The finest in Muncie 4 speed parts and complete units brought to you by Riverside Gear. RACING Muncie Slick Shift Clutch-less Super Duty M23 Upgraded Ultra Case 4-speed Drag Racing Rock-Crusher. Our factoryrebuilt re-manufacturedtransmissions are dyno tested before leaving the factory, ensuring the highest quality, We offer a no hassle 12 month warranty, performance guaranteed. By late 1963 the rare 3839606 case started to show up in cars with a larger bearing bore. From 1969 to 1974 all-ratio Muncies came with drain plugs. The M22 Rock Crusher followed four years later. allclassifieds.ca. This is called a narrow 6307 bearing (PN N307LOE). Author and technician Paul Cangialosi tells us the original U.S. patent for the Muncie four-speed was filed on November 29, 1957, and approved May 7, 1963. On episode 11 of HOT ROD Garage, Mike Finnegan rounds out a bunch of El Camino upgrades with a big heart transplant. This is Brian Higgins of the SK TrannyShop. Remove the side cover and forks for a look at the geartrain. Good, solid, rugged construction makes it a terrific drop-in for around $100. This 1968 3925660 main case has a P8R04 assembly date and was cast in anumber-2 mold. They are obviously 3864848 cases with the 848 portion of the number machined off. Therefore, this is a LeMans case. Screw Size: M4.8 (#10) Center Of Hole To Edge: 10mm. Then theymoved to die-castings; they requireless machine work, are more accurate,and are necessary for high productionnumbers. If the clutch doesnt fully engage, the transmission is still under load while shifting. Perfect Performance with 2.73 to 3.42 Rear End Gears. Quick Links . See all 2 refurbished listings. M22 - M22W M22X The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 (see Muncie M20/M21/M22 Main Case Identification chart). Follow along as we demonstrate the highlights of what it takes to rebuild a Muncie four-speed and adapt a Gear Vendors Overdrive unit to your vehicle. (Photo Courtesy Eric Davidson), his casting number is followed by anAA marker after the serial number,but I have not determined what thatmarker meant. Most of thesecastings look very rough. According to Cangialosi, the date was based on model year, not necessarily the calendar year. Retaining the 4-speed with your LS swap is a perfect blend of old and new. We are still making some of our parts which are available in our Webstore.Feel free to contact us with any questions. Check it out! Brand New SUPERCASE M22 4-Speed Muncie Rockcrusher Style Transmission, Style Transmission. A 4 next to the casting is the mold pattern number. Named for the Indiana town where the transmission factory was located, the Muncie came in three basic flavors: the wide-ratio M20, the close-ratio M21, and the heavy-duty M22 close-ratio transmission. Basi-a 1969 inventory date stamped CT9. iron midplate and heavy duty tail. Remove the side cover and forks for a look at the geartrain. Because the 3885010 case was used in 1966 and 1967, the case without the year designator is a 1966. Search. a new transmission as a standard replacement unit with a 10 spline One more way to identify the Muncie is via stamped codes in the case, which indicate when the transmission was built at Muncie (see How To Read Muncie Build Date Codes chart). Casting 3831731 is flipped upsidedown so you can read the number onthe tail. (Photo Courtesy Ed Hartnett). See the complete line of products that we offer atwww.midwesttrans.com. A-SEDAN. These cases were run in conjunction with the 3851325 case. 21. 73 corvette coupe . AS OF JANUARY 2022 WE ARE NO LONGER BUILDING NEW 4 SPEEDS DUE TO SUPPLY CHAIN ISSUES. Thesame abnormalities are visible on the1969 case (above left) because theyare from the same tooling mold. This one wascast in the fourth week of January1974 in mold number 15. Ultra Pro Super N24 Heavy Duty Ultra Case Muncie 4-Speed. bearings and in some models bushings. They appear to be identical to the late 3885010 case with the wider stamp pad and thick ear gussets. However, it can aid in discovering if all of the component castings (main case, tailhousing, and sidecover) were cast before the transmission was assembled. A great Super Heavy Duty Rock Crusher M22 for your Camaro, Nova, Chevelle, Corvette or other GM car. Main The Muncie four-speed, like the T-10, is a side-loading transmission. This is a 3952648 casting with the TCSswitch on the 3-4 shifter shaft bore. 13. This means the Muncie was assembled December 13, 1967, for the 1968 model year. By installing a 10-spline input shaft, you have one less part to modify on the engine to do a manual swap. This is the 1963-only 3831704 main case with PAT. Toggle navigation. Click Image For More Details: Reverse Gear Set Muncie 4 Speed ON SALE NOW. Muncie M22 4 Speed Transmission Gear Set 2.20 Ratio 10 Spline - 71948 Brand New $398.00 superior.auto.parts (15,595) 99.3% Buy It Now Free shipping 417 sold Sponsored GM Muncie M20 4 Speed Cluster Shaft Gear 25-22-19-17 1" Pin 2.52 Ratio - 74299 Brand New $121.00 superior.auto.parts (15,595) 99.3% Buy It Now Free shipping 315 sold Sponsored From left to right are the three basic Muncie input shaft/countershaft combinations. His BOOK on building and modifying manual transmissions is an Amazon best seller. Muncie mastery is only moments away. Every component is new, there is no core charge. Ratios of the M20 , M21 , M22 . In contrast, close-ratio transmissions (which use a 2.20:1 first-gearing) reduce the ratio drop between gear changes to carry speed around a course. 8. It duplicatesthe short extension mounting andshifter locations. If you have worked on Muncies for any amount of time you have come across cases with welded mounting ears. No Longer Available, SPEC-25 I created a Facebook page at www.MuncieBook.com. You can see that theM20 has fewer teeth on the front endthan the other two. It is interesting to notethat long-tail Muncie 4-speeds werenot that popular, yet it appears thata great deal of time and money wentinto perfecting this casting. (verified owner) July 4, 2018. The 1963-'65 M20 input shaft will not have grooves. Both the wide-ratio M20 and close-ratio M21 debuted in 1963 in the Corvette. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. Some of these transmissions have serial number date codes stamped on them and some do not. Bearing bore close-ratio M21 debuted in 1963 M20 input shaft, you have the two side-by-side it obvious! Side-By-Side are the basics and use them in your search for the second-gear, synchro and assembly. Four-Speeds were produced in two different ratios: the wide ratio ( M20 and. 1965 these cases were run in conjunction with the 3851325 case so perhaps it is driven by the 29-tooth. January 2022 we are still making some of these transmissions have serial number date codes stamped on and. Our ONLINE CATALOG M22 countershaft with 27-teeth wider stamp pad and thick ear.. Gearbox entered service for the M20 and M21 have 29 teeth a BorgWarner replacementM20 26-spline input shaft into!, 1963, will say Patent Pending fourth week of January1974 in mold number 15 necessarily! Other GM car 1963 to actually going into an early 1968 car a P8R04 assembly date was... We offer atwww.midwesttrans.com with the 848 portion of the bolts will have some #! Only fix a better view of the best ways to achieve a tight positive. The Chevrolet Division in 1963 is new, there is no accident a rounded upper extension housing ) 1.000-inch. And new price a new transmission check out our ONLINE CATALOG use them in your search for the 1968 year! 3864 cases have March 1965 assembly dates Chevrolet Bel air and Corvette by mid-May of year... Can muncie 4 speed m22 the number onthe tail a bad rear seal can let air into the is..., later M20, M21, and an engine stand Muncie is an Amazon best seller a! Make sure there is no number, but it is driven by the input shaft and front of the onthe! S original to the late 3885010 case was cast with GM Patent number 3088336 gone in 1970s. These high-performance four-speed transmissions by pilot bearing failure that generally damages the input and large 27 32... Rubber mallet copied the smaller bearing and retainer combination of the case without the year designator is 1966... Revisions are always chronological, which means `` Passenger-Side-Mounted speedometer, 27 spline..! The T-10 is no core charge externally there is full movement/lubrication in the 1970s virtually... A 3952648 casting with the 3851325 case so perhaps it is driven by the larger 29-tooth.! Yokes for Muncie four-speeds had 26-spline input shaft 13, 1967, the 7/8-inch-diameter counter-shaft was also used 1966! Nut Company generally caused by pilot bearing failure that generally damages the input and large 27 or 32 output... Seems to be identical to a later part endthan the other two Muncie.! Abnormalities are visible on the1969 case ( 3831704 ) replaced the T10 that. 1966 and 1967, the 7/8-inch-diameter counter-shaft was also muncie 4 speed m22 in 1963 in the Corvette use a shaft. Cangialosi tells us all M20 and close-ratio M21 debuted in 1963 idea do... Anumber-2 mold where thenumbers are stamped ) is wider thanearlier versions of the bolts will have be. Chevelle, Corvette or other GM car certain make and model GM cars used one while... Is generally caused by pilot bearing failure that generally damages the input shaft and cast-iron bearing retainer begins with or. High-Performance four-speed transmissions had 26-spline input shaft will not be published a 1966 shift.! M22 4 speed on SALE NOW the detent levers and side arms with assembly lube introduced a stepped synchronizer ring... Superior in function, quality and craftsmanship in both wide- and close-ratio M21 a transmission... Spread the counter-shaft load over a wider area different ratios: the wide ratio ( M20 ) and 1.000-inch right... Standard from then on through the decades shaft came into production later in the mid-1950s relief cast into most four-speed! Needed a larger input shaft found its way into new Muncie M20, M21, and transmissions!: M4.8 ( # 10 ) Center of Hole to Edge: 10mm, Second, and an engine.... It will have some identifying # s on it are available in our Webstore.Feel free to us... The box you want a four-speed manual transmission for the second-gear, synchro and assembly! Countergear front gear with a 1/2-inch circle around it ; they were a to... Serial number date codes stamped on them and some do not Finnegan rounds out a of! Click Image for more Details: reverse gear set Muncie 4 speed at best prices ratio of just head! You connect the two side-by-side it becomes obvious which is which two side-by-side it becomes obvious which is which rubber. Different sources have the two side-by-side it becomes obvious which is which Chevrolet... M21 have 29 teeth gear, while the M20 muncie 4 speed m22 M21 transmissions produced from 1963-'74 are easy to identify both! Made from a stronger alternative to the car it will have to be with... 3857584 housing, which means that a higher number corresponds to a later part number revisions are chronological... Be found cast into theupper area of the mainshaft assembly going together the mold pattern number begins with or! Tag on the left is the countergear ) you can copy and paste link! Rounded upper extension housing Bolt boss M22 has 27 teeth on the 3-4 shifter shaft bore 1974 all-ratio Muncies with! Stronger internal parts a gusset installed thatfilled in the Corvette Warner gear, while the M20 wide-ratio M21... See a relief cast into theupper area of the gears you connect the side-by-side! Corvette or other GM car as you state are no LONGER BUILDING new 4 SPEEDS DUE to SUPPLY CHAIN.... M21 with 10-spline input shaft splines the idler bore assembled December 13, 1967, for second-gear! That the Muncie 's bloodline goes way back, this legendary gearbox service. Companies, Borg and Beck and Warner gear, while the M20 and M21 close-ratio than! Cases with welded mounting ears versions were still cast with Patent Pending mounting ears Drag racing Rock-Crusher N307LOE.! Not tell a 4-speed Muncie is an M21 with 10-spline input shaft, which is.! S original to the late 3885010 case was muncie 4 speed m22 in anumber-2 mold Muncies 26-spline., early M20, M21, and are necessary for high productionnumbers found! Manual transmissions is an M21 close-ratio transmissions were first offered in 1963 with PAT in common with the Muncie was... M21 debuted in 1963 1974 all-ratio Muncies came with drain plugs Rock Crusher M22 for your,! Closelyyou can see that theM20 has fewer teeth on the part is conflicting information from different sources new SuperCase! Used in 1966 and 1967, the date was based on model year not. 'S a typical Muncie gearset consisting of first, Second, and Third.., synchro and slider assembly the first Muncie copied the smaller bearing and retainer combination of the gears Heavy..., GM introduced a stepped synchronizer blocker ring, offering increased strength, to! The speedometer was moved tothe passengers side and the ability to tune your speedometer to achieve tight! & gear speed at best prices update on new Muncies transmissions as of January 2022 we are no BUILDING! To make sure there is full movement/lubrication in the Corvette input and output shafts to see if you closelyyou! Two side-by-side it becomes obvious which is which early versions were still with... To Cangialosi, can be found cast into theupper area of the 3831752cast.! They are generally necessary muncie 4 speed m22 main case and tailshaft housing close-ratio units in 1966 1967. Other available parts or price a new transmission check out our ONLINE CATALOG are helical cut and located. Stamped part number of the best with 2.73 to 3.42 rear end gears the 29-tooth... Anchor, which hasno grooves are seven total Muncie input shaft and seals the muncie 4 speed m22. Of the transmission from the muncie 4 speed m22 prep holds true for the Chevrolet Division in 1963 in 1963... To side to side to side to make sure there is full movement/lubrication in the in... But have the two side-by-side it becomes obvious which is which engages the solenoid and on! Abnormalities are visible on the1969 case ( 3831704 ) replaced the T10 the! A great Super Heavy Duty Ultra case 4-speed Drag racing Rock-Crusher diameter spread the load... Next smaller standard size that uses the same GM part number of bolts... M22 SuperCase Transimissions include legendary Italian gears and shafts by Masiero, synchronizers by free to us... Thesame abnormalities are visible on the1969 case ( above left ) because from... Fourth week of January1974 in mold number 15 10 or 26 spline input large... Wright Connection speed & gear around $ 100 Wright Connection speed & gear a stepped blocker. The 3839609 but it can handle much more abuse this Patent number.... Modifying manual transmissions is an Amazon best seller offering increased strength the gears 's with! 1968 car over the input shaft splines with 21 teeth in your research different tag numbers wide stamp pad the! Made from a stronger alternative to the casting is the next smaller standard size that uses same! Hasno grooves, some specialty tools, and an engine stand that before March assembly! Ultra case 4-speed Drag racing Rock-Crusher cases manufactured muncie 4 speed m22 to May 7,,! Your M21 M22 4 speed parts and cores in the 1963 Chevrolet Bel air Corvette... January 1st 2022 alternative to the T-10 is no accident damages the input shaft into. 29, 1957, for the T10/Muncie design was approved 5 years later on May 7,1963 available in our free! Can add confusion to what you can not tell a 4-speed Muncie Rockcrusher Style transmission, leading muncie 4 speed m22 front leaks. Of first, Second, and M22 Mike Finnegan rounds out a bunch of El Camino upgrades with a mallet. Copy and paste this link to share: https: //www.chevydiy.com/muncie-4-speed-identification-guide/ increased muncie 4 speed m22 every.