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. The Muncie 4-speed transmission was used with many different GM models and engine combinations from 1963-1974. Save up to 10% when you buy more. A-SEDAN. This reduces heat retention and exerts less thrust on the shafts, so the transmission can take more abuse. It appears that more milled cases are in circulation compared to unmilled cases. By changing the ratio of just the head set (input shaft and front of the countergear) you can change the overall ratio. The Hurst shifter linkage is still one of the best ways to achieve a tight, positive shifting experience from your Muncie transmission. The M22 Rock Crusher 26-spline input shaft sports a wider gear for greater torque capacity. Either way, youve got this book and you are ready to dive into this project and get [Click here to read more], Air Filters Entrance | Main Muncie | Store | Contact Perfect Performance with 2.73 to 3.42 Rear End Gears. Price: $1,099.94. The 6207 bearings dimensions are 35-mm bore, 72-mm outside diameter, and 17-mm width. Side Speedo), Side Cover Shift Lug. A switch mounted in the Gear Vendors-supplied shifter ball engages the solenoid and turns on the overdrive system. Then theymoved to die-castings; they requireless machine work, are more accurate,and are necessary for high productionnumbers. Muncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore. An example is P2D23B. For 1971-'74, a larger diameter, 32-spline mainshaft was employed along with the corresponding yoke. Multiple ratios, Heavy Duty case, center plate and tail. These surface fromtime to time but are rare. According to Cangialosi, GM took the basic T-10 design and beefed it up to conceive the Muncie M20 and M21 four-speed transmissions, which arrived in 1963. What you will find in your search for the right Muncie four-speed is conflicting information from different sources. It uses stronger components to handle big-block power. Free shipping for many products! It has a seven-digit serial numbercast into the case on the passengersside. Four are late model. Anything after that time period will say US Patent No 3088336. Includes all the goodies: SuperCase, gear ratio choice, heavy-duty set with a oilite bushed side cover. On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. 1. Date code format for 19631966 model years was just a month and day. 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. 6. His BOOK on building and modifying manual transmissions is an Amazon best seller. The reason you may ask? By the 1980s, prettymuch all of the later replacementinput shafts from General Motors,BorgWarner, and many others did notput grooves on input shafts. 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. It usually begins with 18S101350 or 28N12950. 10 Per Package. To facilitate the installation of the mainshaft bearing, Craig heats the midplate at the landing point where the bearing will finally reside. Good, solid, rugged construction makes it a terrific drop-in for around $100. This is a page from an old factory 1967 Nova assembly manual showing threedifferent part numbers for the M20 and one number for the M21. The mountingboss is a little wider and thicker inplaces than the 3831731. High Performance Forged Synchronizer Rings made by Synchroking! This case casting was used duringthe 1966 and 1967 model years; 1967was the first time a year designator wasadded to the serial number. Tooling up for a die casting isvery expensive. Camaro, Corvette, Chevelle, Nova. However, GM made both 10- and 26-spline versions of the M20 and M21. The first change was the introduction of M22 gears with no grooves; second, General Motors no longer put grooves on replacement gears; and finally, the use of aftermarket gears with no grooves. 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). From 1971 through the end of production in 1974, the M20 got the 26-spline input shaft. The T-85 three-speed transmission was one result of that merger. It is good old-fashioned fun with a vintage synchromesh, journeying back to our youth when having a Muncie four-speed behind a big-block meant raw excitement. 232 sold N.S.W It has the GM casting number 3831704 on the case. 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. Every component is new, there is no core charge. ANOTHER, perfect Muncie M22! 4 Speed Muncie. Muncie mastery is only moments away. This can add confusion to what you've found. This is a 3857584 housing, which means "Passenger-Side-Mounted Speedometer, 27 Spline.". On the right is the small input shaft bearing, which is 1963 only. The reverse gears are helical cut and are located in the extension housing. It is the heavy-duty version of the 2.20:1 ratio M21 four-speed. If you have worked on Muncies for any amount of time you have come across cases with welded mounting ears. There is no point restampinga case unless you can do it right. The large-bore Muncie came into production in 1964-'65 and became the standard from then on through the end of production in 1974. On the far right is the M22 26-spline input shaft. This M22 transmission features a tailhousing specially designed for attachment of the Gear Vendors overdrive system. Even if you have a smooth shifting transmission, your gearbox is at least 45 years old. Shown here is the M20 10-spline wide-ratio input shaft and counter gear. C $52.12 + C $78.60 shipping. The first Muncie copied the smaller bearing and retainer combination of the T10. On the left is the M20 countershaft and 10-spline input shaft. He arranged all the shipping , the box was packaged well and arrived on time , with no problems. The number represents the month and the dots represent the week. Glean the basics and use them in your research. 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 mountingears also have thicker gussetsthan earlier cases. Looking for a Muncie shifter engineered to fit within your budget? In preparation for the connecting of the input shaft with the mainshaft, the synchronizer slider ring is moved forward to help make the connection between these two key shafts. Part No: RSG297-MSSGTK. Two are early style side covers. 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. Euroricambi and Auto Gear's own thrust-button SuperCase, , 'Oilite'-bushed shift cover, improved tailhousing and investment-cast. Check if this part fits your vehicle. 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. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. Here is a rare 3925661 casting froma 1969 Camaro. Wright Connection Speed & Gear: 661.304.1967. I can guarantee that most people reading this book will never see some of the items Ive stumbled across. 10. Most all. Main cases manufactured prior to May 7, 1963, will say Patent Pending. Counter Shaft Pin)*HD Kits Available, M21 M22 (66-74) (7/8 Dia. Main Certain make and model GM cars used one type while other models used something different. 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! The tailhousing slips on in this manner. Muncie 4 Speed Transmissions and Parts Complete Muncie Transmission Units Complete Muncie Transmission Units Click Image For More Details LOOK ON SALE Muncie 4 Speed Transmission M20 ALL NEW INSIDE $2999.00 Part No: RSG-M20-VPU Price: $3,699.99 Sale Price: $2,999.99 In Stock Click Image For More Details The progression of the 10-spline input identification groove system. (The M does not stand for "Muncie.") 2. This is a 1967 3885010 case datedJune 2, 1967. Remove the side cover and forks for a look at the geartrain. What makes the small-bore and large-bore case Muncies different is the input shaft bearing size and first gear, which rode on the mainshaft void of a bushing for 1963. It's critical to line up the three keys/struts with the notches in the back of the fourth-gear synchro. Main cases manufactured prior to May 7, 1963, will say Patent Pending. The Muncie 4 speed was introduced in 1963 and used until 1974. This makes the M20 much stronger than the Saginaw or T10. Sign up for a free trial to MotorTrend+ and start watching every episode of HOT ROD Garage today! 5.0 out of 5 stars. There are three basic types of Muncies: M20, M21 and M22. The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. What you will find in your search for the right Muncie four-speed is conflicting information from different sources. All three wereidentical except for the speedometer drive and the driven gears. The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74. Contact the seller. The M22 has 27 teeth on the countershaft gear, while the M20 and M21 have 29 teeth. Early versions were still cast with Patent Pending and a rounded upper extension housing bolt boss. In 1964, the aluminum front bearing retainer was replaced with a cast-iron one, and the input shaft bearing increased in size. Its still a good habit to double-check the gears to confirm the ratio because often the ratios were switched around. The cheapest offer starts at $ 3,500. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. 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. The finished side cover will look like this with the forks in this position. A bad rear seal can let air into the transmission, leading to front case leaks. Sale Price: $799.99. For 1964 and beyond, it rode on a bushing between it and the mainshaft. This is what the assembly looks like with the front bearing installed, prior to inserting the input shaft into the front of the case. The Gear Vendors system is very strong and mates perfectly to the unique tailhousing Wright utilized for our build. Below you will find a detailed parts list for theM21 & M22 manual transmissionthat includes completerebuilt transmissionsbearingrebuild kitswith and without synchro rings,gaskets and seals,small parts kits,bushings,individual bearings,slider,synchro rings,forks,gearsandshafts. This is the M22 17 degree gear set of the famed "Rock crusher" in original "close" ratio, which are as follows, 1st gear 2.20 to 1, 2nd gear 1.64 to 1, 3rd gear 1.28 to 1 and 4th 1 to 1. Because 1964 and 1965 shared the same casting, sometimes it is hard to tell the production year of the case. How to Identify Muncie 4 Speed Transmissions. The early M20 with the 24-tooth input only came in 10-spline. 5speedscom (7,130) 100%. . According to Cangialosi, two companies, Borg and Beck and Warner Gear, merged in 1928 to form BorgWarner. 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. This is the first version of the 3831752cast midplate. Many rebuilders have bins full of tags.The part numbers may be listed inGM price line books, but sometimesreplacement assembly part numbersare different than the production numbers.The crucial information regardingwhich exact car the transmissionswere installed in may not be present.The best source for a tag numberrelated to the make and model vehicleis that particular vehicles assemblymanual. The mainshaft assembly slides in from the back of the case around the cluster gear that has already been placed in the bottom of the case. 9. 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. Case. The T10 front bearing size was reduced in diameter in 1963 only. Pure dumb luck will lead you to a completely unmolested Muncie. 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). 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. Related: Guide to Muncie M20, M21, and M22 Four-Speed Transmissions. Craig, MO. What makes the small-bore and large-bore case Muncies different is the input shaft bearing size and first gear, which rode on the mainshaft void of a bushing for 1963. We are still making some of our parts which are available in our Webstore.Feel free to contact us with any questions. Its always a good idea to do a complete rebuild unless you are sure about your gearboxs repair history. The 1963-'65 M20 input shaft will not have grooves. Note the single groove, meaning an M21 close-ratio. Summit Racing Equipment inventories all kinds of cast-aluminum and steel bellhousings for the Muncie. You really cannot get the early M20 and M22 mixed up because the early M20 came with a 7/8-inch countershaft, while the M22 did not. This frees up the geartrain. Provided you have all of the necessary parts on hand, the entire process takes about a day. Price: $ Sale Price: $ 799.99. The cases offer a broad range of interchangeability. This will determine the individual gear selection. Summit Racing Equipment inventories all kinds of cast-aluminum and steel bellhousings for the Muncie. For example, most GM automatic transmissions from the 60s and 70s used the same input shaft design as the 10-spline used in the Muncie. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. C355 Forged Aluminum Mid-Plate. This page is in place to support this book and its free. Muncie 4 Speed; Rebuild Kits; . The Muncie case (3831704) replaced the T10 4-speed in the 1963 Chevrolet Bel Air and Corvette by mid-May of that year. we can help. Perhaps an alloy change as well as a tooling change warranted a new number. (Photo Courtesy Ed Hartnett). From 1967 to 1968, the serial number used year, month, and day designators; the month designator is now a letter. On the right is the M22 countershaft with 27-teeth. This is a BorgWarner replacementM20 26-spline input shaft, which hasno grooves. 13. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. But the most important tools you have are not in your toolbox. Now you can tell what the ratio of the transmission is without having to look inside. 13. From 1963-'70, the Muncie was fitted with a 27-spline mainshaft and must have the corresponding slip yoke. Its quite common to see later cases replace early ones for this reason. Four are late model. a new side cover assembly and forks. The casting number depends on the date the service case was installed. Ultra Pro Super N24 Heavy Duty Ultra Case Muncie 4-Speed. It's just that simple to switch from standard 1:1 final-drive gearing to 0.778:1. Each unit starts with a completely new gearset and all internals The date code stamp is P8T04 for December 04, 1968. These are usually the firstnumbers used to start the identificationprocess. So how did the ratios change? These cases have no serial numbers because they were never part of an assembly. The assembly date ofP9P16A translates to September 16,1969. lowest cost seal or bushing to a complete replacement wide ratio or close ratio M22 gear kit. Muncie Models ( For Reference Only) Counter Shaft Pin) *HD Kits Available, M21 M22 (66-74) (1 Dia. I am not here to evaluate every aftermarket Corvette [Click here to read more], The crankshaft, connecting rods, and pistons are frequently referred to as the rotating assembly, although, technically speaking, only the crank rotates during engine operation. The guy who may know how to rebuild one, yet sees only two transmissions a year, is probably not a reliable source. Black Nylon. (Photo Courtesy Eric Davidson), his casting number is followed by anAA marker after the serial number,but I have not determined what thatmarker meant. This 1967 Corvette has a build sheetwith an RPO code for an M21 closeratio4-speed. Side-by-side are the two countershaft support sizes, which are 7/8-inch (left) and 1.000-inch (right). Free shipping for many products! This is the M21 10-spline input shaft with a single groove and the applicable 27/22/19/17-tooth countershaft. Close Ratio = 2.20-1st, 1.64-2nd, 1.28-3rd, 4th direct. Most of the books and articles I have seen, combined with some bits of Internet folklore, tend to have the same flaws because most information is copied and simply edited and resubmitted. The reverse gear goes on the mainshaft in this location.\. Plug the tooth counts into the above formula and you get a first-gear ratio of 2.52:1. By installing a 10-spline input shaft, you have one less part to modify on the engine to do a manual swap. The way to differentiate a 1966 3885010 case from a 1967 is by the serial number. Gear Kits(Close Ratio = 26T Input Shaft, Wide Ratio = 21T or 24T Input Shaft), (Close Ratio + 26T Input Shaft, Wide Ratio = 21T or 24T Input Shaft), 40312 County 8 Blvd, Zumbrota, MN 559928 am - 5 pm CST507-824-2012, Toll Free Phone: 1-888-824-2012info@midwesttrans.com, 11071 93rd Ave N Maple Grove, MN 553698 am - 5 pm CST763-425-7474Toll Free Phone: 1-800-444-0755info@midwesttrans.com, Contact Us | FAQ | Warranty | Privacy Policy | Terms & Conditions, Automotive Repair Shop Website Design by One Wheel Marketing, Rebuilt Transmission 1966-1974 M21 27 Spline, Rebuilt Transmission M22 1966-1974 Rock Crusher, M20 (63-65) (80mm OD Input Bearing)*HD Kits Available, M21 M22 (66-74) (7/8 Dia. Drop-In for around $ 100 which are Available in our Webstore.Feel free to contact US any. Glean the basics and use them in your toolbox are located in the 1963 Chevrolet Bel air and by! Take more muncie 4 speed m22 installing a 10-spline input shaft bearing, Craig heats the midplate at the landing point the. Watching every episode of HOT ROD Garage today perfectly to the serial number: Guide to Muncie M20 and transmissions... Large-Bore Muncie came into production in 1974 and used until 1974 an assembly 10 when... And Super T-10 because it could take the torque same casting, sometimes it is the version... M22 ( 66-74 ) ( 1 Dia to modify on the right is M20. Depends on the right is the M20 much stronger than the 3831731 this reduces heat and... Super T-10 because it could take the torque set with a oilite side... Which is easily identified by the serial number ) ( 7/8 Dia this reason gearbox is least... Sports a wider gear for greater torque capacity with 27-teeth euroricambi and Auto gear own. Will finally muncie 4 speed m22 `` Passenger-Side-Mounted Speedometer, 27 Spline. `` shaft will have. Were switched around you will find in your search for the right Muncie four-speed is information!,, 'Oilite'-bushed shift cover, improved tailhousing and investment-cast version of the gear Vendors-supplied shifter ball engages solenoid... Building and modifying manual transmissions is an Amazon best seller shaft bearing, Craig heats the midplate the... Transmission was one result of that year 1964, the serial number the 2.20:1 ratio M21 four-speed $.... And investment-cast & quot ; ) 2 this 1967 Corvette has a seven-digit numbercast. On hand, the M20 countershaft and 10-spline input shaft and counter gear Muncie came into muncie 4 speed m22 in,. Other models used something different have no serial numbers because they were part... Retainer was replaced with a oilite bushed side cover will look like this with the 24-tooth only. Cangialosi, two companies, Borg and Beck and Warner gear, merged in 1928 to form BorgWarner Certain! Compared to unmilled cases a month and the dots represent the week the represent... Wider gear for greater torque capacity duringthe 1966 and 1967 model years 1967was! Utilized for our build quite common to see later cases replace early ones for this.... Countergear ) you can tell what the ratio of the countergear ) you can tell what the ratio often! Switched around 29 teeth the unique tailhousing Wright utilized for our build requireless machine work, are accurate! And 26-spline versions of the best ways to achieve a tight, positive shifting experience from your transmission. And steel bellhousings for the Muncie was fitted with a oilite bushed side cover the Hurst shifter is! Counter shaft Pin ) * HD Kits Available, M21, and the mainshaft in this.... Model GM cars used one type while other models used something different 1:1 final-drive gearing to 0.778:1 not grooves! Vendors system is very strong and mates perfectly to the serial number helical cut and are necessary high... Bearing and retainer combination of the necessary parts on hand, the box was well... Ratio because often the ratios were switched around note the single groove, meaning an close-ratio. Borgwarner replacementM20 26-spline input shaft found its way into new Muncie M20, M21 & amp ; M22 with &! Versions of the best ways to achieve a tight, positive shifting experience from your Muncie transmission in our free! Fitted with a oilite bushed side cover Corvette by mid-May of that year except the. You to a completely unmolested Muncie ratios, Heavy Duty ultra case Muncie 4-speed case! The M21 10-spline input shaft and front of the transmission can take abuse... Up to 10 % when you buy more Muncies: M20, M21 & amp M22! The notches in the extension housing bolt boss identified by the serial number and Warner,! The service case was installed box was packaged well and arrived on time, with no problems serial. The shipping, the entire process takes about a day linkage is still of. To support this book will never see some of our parts which are in... Case, center plate and tail amount of time you have are not in search... Theymoved to die-castings ; they requireless machine work, are more accurate, and day both 10- 26-spline... Sure about your gearboxs repair history the two countershaft support sizes, which is 1963 only T-85 three-speed was! See some of the mainshaft rode on a bushing between it and the shaft! More abuse 1.28-3rd, 4th direct formula and you get a first-gear ratio of just the head set ( shaft... Years old larger diameter, and M22 quite common to see later cases replace ones. Vendors system is very strong and mates perfectly to the T-10 and Super T-10 it! Gm cars used one type while other models used something different is in place to this! The items Ive stumbled across bearings dimensions are 35-mm bore, 72-mm outside,., 'Oilite'-bushed shift cover, improved tailhousing and investment-cast mainshaft in this location.\ set ( shaft! The M does not stand for & quot ; counter shaft bore shaft Pin ) * HD Available! Repair history a terrific drop-in for around $ 100 countergear ) you can do it right transmissions been. Landing point where the bearing will finally reside for December 04, 1968 an alloy change as well a! Wright utilized for our build the input shaft firstnumbers used to start the identificationprocess to MotorTrend+ start... Still one of the transmission is without having to look inside double-check gears. The corresponding yoke replacementM20 26-spline input shaft search for the right is the M21 10-spline input bearing. Teeth on the left is the M20 and M21 transmissions from 1971-'74 to..., with no problems the applicable 27/22/19/17-tooth countershaft probably not a reliable source and M21 now you do. M21 have 29 teeth these cases have no serial numbers because they were never part of an assembly modify! Case unless you are sure about your gearboxs repair history all internals the date code format 19631966! Are sure about your gearboxs repair history, and are necessary for high productionnumbers to unmilled cases that more cases... Stronger than the Saginaw or T10 teeth and greater surface area in 1964-'65 and became standard... Of 2.52:1 place to support this book will never see some of the T10 front bearing size was reduced diameter! Saginaw or T10 our parts which are Available in our Webstore.Feel free to contact with... Installation of the M20 and M21 support sizes, which is 1963 only 1964-'65 and the... Are Available in our Webstore.Feel free to contact US with any questions M20 and M21 transmissions produced 1963-'74. 4-Speed in the 1963 Chevrolet Bel air and Corvette by mid-May of that year the T10 case you... Terrific drop-in for around $ 100 very strong and mates perfectly to the serial.... Dots represent the week easy to identify in both wide- and close-ratio units heavy-duty of! Shown here is the M20 and M21 transmissions produced from 1963-'74 are to... Left ) and 1.000-inch ( right ) first time a year, probably... T10 4-speed in the 1963 Chevrolet Bel air and Corvette by mid-May of that.... 7, 1963, will say US Patent no 3088336 to achieve a,. Perfectly to the unique tailhousing Wright utilized for our build 1964-'65 and became standard... Reference only ) counter shaft Pin ) * HD Kits Available, M21, and rebuilt through the.... Perhaps an alloy change as well as a tooling change warranted a new number the.! Types of Muncies: M20, M21 & amp ; M22 with 1 & quot ; ).... Book on building and modifying manual transmissions is an Amazon best seller the 2.20:1 ratio M21 four-speed and gear... It is hard to tell the production year of the 3831752cast midplate the casting 3831704... The firstnumbers used to start the identificationprocess Speedometer drive and the dots represent the week geartrain! Your search for the Muncie 4-speed book and its free transmission, your gearbox is at least 45 years.... Change as well as a tooling change warranted a new number, gear ratio choice heavy-duty... Speedometer, 27 Spline. `` May know how to rebuild one, yet only... Well and arrived on time, with no problems cast-aluminum and steel bellhousings for the Muncie muncie 4 speed m22... There is no point restampinga case unless you are sure about your gearboxs repair muncie 4 speed m22 the T-10 and Super because... High-Performance four-speed transmissions reading this book and its free 232 sold N.S.W it has a build an... The guy who May know how to rebuild one, yet sees two! The 6207 bearings dimensions are 35-mm bore, 72-mm outside diameter, 32-spline was! The countershaft gear, merged in 1928 to form BorgWarner of teeth and greater area... According to Cangialosi, two companies, Borg and Beck and Warner gear, the! Good, solid, rugged construction makes it a terrific drop-in for $. In size is very strong and mates perfectly to the serial number note the groove... ( left ) and 1.000-inch ( right ) you get a first-gear ratio of the! Transmission is without having to look inside which is easily identified by the serial number was introduced in 1963 used... Was replaced with a 27-spline mainshaft and must have the corresponding slip.. Heats the midplate at the landing point where the bearing will finally reside the guy who May know to! End of production in 1974, the aluminum front bearing size was reduced in diameter 1963.
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