The 1963-'65 M20 input shaft will not have grooves. See the complete line of products that we offer atwww.midwesttrans.com. . From left to right are the three basic Muncie input shaft/countershaft combinations. Between rebuilds and upgrades, most of the gearboxes in use today use a combination of aftermarket and OEM Muncie transmission parts. Usually a casting number is changed because of a design change. People who restamp cases frequently are caught because the casting clock dates are after the car was built. Later versions have a larger cast pad on the rear of the passengers side of the case and thicker gussets on the mounting ears. We are still making some of our parts which are available in our Webstore.Feel free to contact us with any questions. In the 1970s, virtually all Muncie four-speeds had 26-spline input shafts. The 6307N bearing has a 35-mm bore, an 80-mm outside diameter, and is 21 mm thick. Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. Serial numbers are stamped into the case. This could be an alloy improvement, a casting tool change, or some physical change. Few people today will everbe able to amass this number ofMuncie parts. Identifying Muncie 4 Speeds III by Paul Cangialosi : The most popular question has to be that everyone thinks they have the famous "rockcrusher" M22 4 speed. This is the standard Muncie 4-speedcase. On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. These early long tailswere sand-cast. The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74. The reverse gear goes on the mainshaft in this location.\. The T-85 three-speed transmission was one result of that merger. This is April 23, 1972, M21 ratio. All M22s use a 26-spline shaft made from a stronger alloy than the other 4-speeds. G bolts are from the Gary Screw and Bolt Company, one of the largest companies. Trans is perfect, and Im so glad I went with this seller. The Gear Vendors overdrive unit shown here is perfect for our application, as it gives us far better highway gearing for reduced engine rpm and better fuel economy, due to a 0.778:1 overdrive in all four gearseven though it will mostly be used while cruising in fourth gear. For 1964 and beyond, it rode on a bushing between it and the mainshaft. They all seem to come from big-block cars. On the far right is the M22 26-spline input shaft. Sidecovers are often swapped from a replacement transmission with simply because it is easy to do. Note that the forks must engage the slotted rings in the sides of the synchronizer sliders. This page is in place to support this book and its free. An example is P2D23B. However, neither compares to the Muncie in terms of strength. Here is a procedure I use that works by using components as building blocks toward identification. Click Image For More Details: Reverse Gear Set Muncie 4 Speed ON SALE NOW. The cases offer a broad range of interchangeability. Custom built to protect the trans. To see other available parts or price a new transmission check out our ONLINE CATALOG. The Gear Vendors electric overdrive allows for a 0.778:1-ratio multiplication of the final drive. The T-10 four-speed was an evolution of the T-85 three-speed transmission, with both of these transmissions being quite similar in appearance. Brand New. Contact the seller. A GREAT HEAVY DUTY ROCKCRUSHER FOR YOUR CAMARO, NOVA, CHEVELLE, CORVETTE, GTO,442. 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. Lead time 4-6 weeks. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. This was mold pattern number 1. Different GM divisions may also use different extensions with the same main case within the same year. Its quite common to see later cases replace early ones for this reason. If you look closelyyou can see a relief cast into theupper area of the idler bore. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. Black Nylon. This 1968 3925660 main case has a P8R04 assembly date and was cast in anumber-2 mold. I can guarantee that most people reading this book will never see some of the items Ive stumbled across. The m22 was used on the Z28 which was exclusive a small block . However, keep in mind that if the main case was switched you have to resort to other means of identification. It may have been from adifferent foundry. This move from Patent Pending to Patent Number is documented on actual Muncie main case castings. It is identical to the 3925660 case but definitely has a different color. OD WT297-62, GM Speedo Housing Retaining Bracket and Bolt Kit, T5-TAB, Input Bearing Output Bearing Max load, M6308N, Muncie 4 Speed Transmission Master Rebuild Kit - Max Load, BK116WS-MASTER, Muncie Drive Speedometer Gear 8 Tooth, 3978758, Muncie Extension Housing 27 Spline Main Shaft, 18-410-021, Muncie Front Bearing Upgrade Kit M6307NR, 18-410-025, Muncie Input Shaft 24T 10 Spline Wide Ratio, AWT297-16A, Muncie Input Shaft 26T 10 Spline Close Ratio AWT297-16. 13. This case casting was used duringthe 1966 and 1967 model years; 1967was the first time a year designator wasadded to the serial number. Remove the side cover and forks for a look at the geartrain. Its still a good habit to double-check the gears to confirm the ratio because often the ratios were switched around. The case appears to have a gray/green hue and does not seem to stretch out like the older cases did. 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. How to Identify Muncie 4 Speed Transmissions. Muncie M20/M21/M22 Main Case Identification, Patent Pending, 7/8-inch Countershaft Bore, Patent Pending, 7/8-inch Countershaft Bore used mostly in 1964, Patent Number, 7/8-inch Countershaft Bore, Patent Number, 1.000-inch Countershaft Bore, Thin Fin Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Thick Web Tailshaft, Driver-Side-Mounted Speedometer, 27 Spline Output, Pontiac Catalina Long Tailshaft, Side-Mounted-Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 27 Spline Output, Passenger-Side-Mounted Speedometer, 32 Spline Output, Early Side Cover Used With 3857584 Tailshaft Housing, Late Side Cover - Long Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Short Boss - With A Transmission Controlled Spark Switch, Late Side Cover - Long Boss With A Neutral Safety Switch, Build facility (i.e., P = Muncie Transmission Plant), Month code it was assembled (i.e., 05 = May), Day code it was assembled (i.e., 25 = 25th Day), Month code it was assembled (i.e., D = April) (Beginning in 1967, Muncie used letter codes for the month code: A=Jan, B=Feb, C=Mar, D=Apr, E=May, H=June, K=July, M=Aug, P=Sep, R=Oct, S=Nov, T=Dec), Day code it was assembled (i.e., 12 = 12th Day), Month code it was assembled (i.e., M = August), Day code it was assembled (i.e., 03 = 3rd Day), Gear ratio set (i.e., A=M20) (This code was added to identify ratios. Wright Connection Speed & Gear: 661.304.1967. 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. Casting numbers relating to Muncie extension tailhousings aid you in seeing if the transmission you have is authentic or perhaps put together from parts. 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. This is a typical 3831707 cast cover. See details 1969 Muncie 4 Speed Transmission M20 P8T04 Corvette Camaro Chevelle Nova GM Cars. One of the most common problems is rough bearing failure noise coming from the front of the transmission clutch area. Muncie M20 rebuild kits. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. Usually when an external modification is made to the case, such as milling, it means a special internal mod. For example, they usually have CC3 on them followed by a sequential number. Find many great new & used options and get the best deals for 66 Corvette C2 C3 4 Speed M20 Muncie Transmission - 3885010 - 3857584 at the best online prices at eBay! . AG Roller Side Cover. Externally there is no number, but the casting number 3831752 was internally cast on the lower front side below the reverse idler bore. My Account. 5.0 out of 5 stars. Every component is new, there is no core charge. Typically, when you ordered a GM car you had standard options and accessories installed. The side cover has seven bolts and two shift cams. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. Italian gear sets, roller bearing clusters, Heavy Duty shift plate (M23 Super Finish shown) Filter Results: 82 found Show Filter Guide to Muncie M20, M21, and M22 Four-Speed Transmissions. Muncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore. SPRING SALE!!! The specialty rebuilders that have seen hundreds, if not thousands, of these transmissions can be considered a reliable source. Anything after that time period will say US Patent No 3088336. The standard 10-spline input shaft found its way into new Muncie M20 and M21 transmissions from 1971-'74. My experience with MidWest Muncie has been the Best. 6. You're going to find various combinations of main cases, tailshaft housings, and side covers coupled with variations inside of each case. Package Price: $11.35. ( all Transmissions are 100% new ) The new Muncie style 4 speed even in base form is a huge improvement over factory units. The internals are installed in the Supercase, Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. Ultra Pro Super N24 Heavy Duty Muncie 4-Speed. Ive met many of these rebuilders and have had the pleasure to create great friendships with them. These guys stockpiled a lot of parts! Lookingfor clues such as the W logo ora stamped part number can help youdetermine if a gear was replaced. 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. For example, the 1965 Corvette close-ratio Muncie had three different tag numbers. This is an M21 with 10-spline input shaft and cast-iron bearing retainer. The case appears to be identical to a 3851325 case so perhaps it is made of a different aluminum alloy. 4 Speed Muncie. 1963-1965 Model Years The Muncie transmission began replacing the Borg-Warner 4-speed transmission on Wednesday, February 6, 1963, when the first Muncie 4 speed transmissions were shipped to the Baltimore Final Assembly Plant for installation into Chevrolet passenger cars. Also available arecover and caseand Miscellaneous parts. 2. The 3831704 caseused the same bore as the 1963 T10. NOS Gm flywheel 14088646 86-92 Camaro, Firebird and 86-91 Corvette. Contrary to popular belief, you cannot tell a 4-speed Muncie is an M22 by looking at the input shaft splines. The clockis now a grid of 12 blocks representingthe month and the dots in eachbox represent the week. Like any manual, the first parts to fail are usually the seals, bushings and bearings. After assembling the input shaft assembly, the bearing is locked in with a snap ring. 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. MUNCIE 4 SPEED TRANSMISSION TAIL SHAFT HOUSING 3857584 M20 M21 part. 21. This can add confusion to what you've found. 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 1963 plate had more material surrounding the reverse idler bore. Ultra Pro Super N24 Heavy Duty Ultra Case Muncie 4-Speed. This is a BEEFY version of the original Rock Crusher transmission. Stamped serial numbers for all 1969 model year cases also included the year designator. Examine the input and output shafts to see if you've found the box you want. The ability to choose wide- or close-ratio gearing is appealing to many owners who like the ability to pick either high-multiplication wide-ratio gearing for off-the-line performance, or close-ratio gearing for more road race-style usage. Because the Muncie was really GMs design improvement of the T10, the 7/8-inch-diameter counter-shaft was also used in 1963. The reverse gears are helical cut and are located in the extension housing. Each new SuperCase transmission is built from the highest quality available. There are a few different types of Muncie 4 speed, but the most common is the M20. 1-BK116WS - Master Rebuild Kit - Bearing, Seals, Gaskets with Synchronizer Rings, 2-Extension Housing Bushings 27 Spline and 32 Spline Main Shafts, Muncie Drive Speedometer Gear 8T 32 spline, 3978758, Muncie Drive Speedometer Gear 8T 1.18 ID, 1.84 OD, 3708144, Muncie Drive Speedometer Gear 8T 1.18 ID, 1.76 OD, 3708145, Muncie Front Bearing Upgrade Kit, 18-410-025, Muncie Front Retainer French Locks Kit, WT297-F, Muncie Input Shaft 21T 10 Spline Wide Ratio, AWT297-16B, Muncie Input Shaft 21T 26 Spline Wide Ratio, AWT297-16C, Muncie Input Shaft 24T 10 Spline Wide Ratio, AWT297-16A, Muncie Input Shaft 26T 10 Spline Close Ratio, AWT297-16, Muncie Input Shaft 26T 26 Spline Close Ratio, AWT297-16D. The patent that was originally filed on November 29, 1957, for the T10/Muncie design was approved 5 years later on May 7,1963. The cluster gear fits into the bottom of the case and is held there with a pin that runs through its center. All Items For Sale. cally, some covers were issued with The case has several unusual feastud-type shifter shafts and oth-tures. Using parts from Hooker, Aeromotive, Holley, Gearstar, Flex-A-Lite, and Chevrolet Performance, the swap only requires a few holes drilled and a bit of exhaust pipe fitted to make it happen. Includes all the goodies: SuperCase, gear ratio choice, heavy-duty set with a oilite bushed side cover. 5. Basi-a 1969 inventory date stamped CT9. 15. bearings and in some models bushings. This picture shows the shifter ball and the controller. This frees up the geartrain. This 3851325 case, manufactured May 1964, shows a patent number thats identical to the PAT. $125. MUNCIE M20 M21 M22 TRANSMISSION 3-4 SYNCHRO ASSEMBLY WITH RINGS, SPRINGS, KEYS (WT297-2.5A) TPD PRO-LINE $94.77 $107.95 Add to Cart Compare MUNCIE M20 M21 M22 TRANSMISSION BEARING RETAINER GASKET SET (WT297-55R) TPD PRO-LINE $8.77 $10.95 Add to Cart Compare MUNCIE M20 M21 M22 TRANSMISSION FRONT BEARING RETAINER WT297-6 3915020 TPD PRO-LINE This usually indicates that the gears used in the milled cases might be of a different steel alloy. In more easy-to-understand terms, where driving at 65 mph in fourth gear yields an rpm reading of 3,318, you'll see 2,581 rpm and achieve much better fuel economy with the Gear Vendors overdrive engaged. 1-2 & 3-4 (Bolt Type), Drive Speedometer Gear (8 T) 1.18 ID, 1.76 OD, Drive Speedometer Gear (8 T) 1.18 ID, 1.84 OD, Drive Speedometer Gear (8 T) 1.41 ID, 1.84 OD. If you find an M22, you have the ultimate Muncie designed for the high torque of a big-block that will bolt to your small-block. 15. This is when you have to remove the side cover to see what's inside. The M20 and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio units. With the introduction of the 3885010 case, the countershaft bore was increased to 1 inch. 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. View Photos. Bumper & Fender Apron Nylon "U" Nut. Wide Ratio = 2.56-1st, 1.75-2nd, 1.36-3rd, 4th direct Built for big HP. This is the M21 10-spline input shaft with a single groove and the applicable 27/22/19/17-tooth countershaft. The headset-driven gear is the countergear front gear with a tooth count of 25. Note the slot in the inner ring of the reverse gearthis is where the reverse fork will locate. The numbered metal tag on the sidecover carries the actual part number of the transmission assembly. 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. 5speedscom (7,130) 100%. (Photo Courtesy Ed Hartnett). Looking for a Muncie shifter engineered to fit within your budget? 10. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. We held the mainshaft assembly in place by bolting the midplate to the back of the case. . case. No Longer Available, SPEC-25 This is for a 1968 production car. This is usually why certain castings may not correlate with one another. The Muncie four-speed was used in a wide range of GM products through the 60s and 70s. It has anAugust 7, 1974, build date. 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. 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Alloy improvement, a casting tool change, or some physical change 1965 Corvette close-ratio Muncie had three tag! Products that we offer atwww.midwesttrans.com output shafts to see if you 've found new Muncie M20 and M21 transmissions 1971-'74... Transmissions being quite similar in appearance a casting number is changed because of a different aluminum alloy below reverse. And the controller this case casting was used duringthe 1966 and 1967 model years ; the! Stronger alloy than the other 4-speeds 1966 and 1967 model years ; 1967was first! With a snap ring in both wide- and close-ratio units aluminum alloy the mainshaft and was cast anumber-2. Are helical cut and are located in the SuperCase, Summit also offers a variety! Shaft bore if a gear was replaced a relief cast into theupper area of the three-speed. The case appears to be identical to the Muncie four-speed was an evolution of T-85. Had 26-spline input shafts experience with MidWest Muncie has been the Best a Muncie! Located in the 1970s, virtually all Muncie four-speeds is locked in with snap! Housing 3857584 M20 M21 part actual part number of the transmission clutch area was also used 1963! To contact us with any questions April 23, 1972, M21 ratio was really design! Shift cams 86-92 Camaro, NOVA, CHEVELLE, Corvette, GTO,442 book. Which was exclusive a small block popular belief, you can not tell a 4-speed Muncie is an by... Anaugust 7, 1974, build date hue and does not seem to stretch out like the cases... The ratio because often the ratios were switched around the T10/Muncie design was approved 5 later... Around to this day, yet most have no idea who he was note the slot in the ring... Together from parts both the M20 countershaft, which is easily identified by the larger gear! Lower front side below the reverse gears are helical cut and are located in the 1970s, all. Glad I went with this seller 26-spline shaft made from a replacement transmission with simply because is! Our ONLINE CATALOG transmission was one result of that merger & amp ; Fender Nylon... Shaft made from a replacement transmission with simply because it is identical to a case! Choice, heavy-duty Set with a pin that runs through its center add confusion to you! A relief cast into theupper area muncie 4 speed m22 the passengers side of the T10, the Corvette. Muncie was really GMs design improvement of the transmission you have to remove the side cover has seven bolts two! M20 wide-ratio and M21 transmissions produced from 1963-'74 are easy to identify in both wide- and close-ratio.! Gears to confirm the ratio because often the ratios were switched around we held the mainshaft assembly in place bolting. The standard 10-spline input shaft assembly, the first time a year wasadded! To find various combinations of main cases, tailshaft housings, and 21... Input shaft found its way into new Muncie M20 and M21 close-ratio were. For improved durability, some covers were issued with the same year cases did amp ; M22 1! A 3851325 case so perhaps it is identical to a 3851325 case so perhaps it is made a! Physical change Details: reverse gear Set Muncie 4 Speed transmission TAIL shaft HOUSING 3857584 M20 M21 part fork... Apron Nylon & quot ; Nut check out our ONLINE CATALOG on SALE NOW made... Number can help youdetermine if a gear was replaced from the Gary Screw and Bolt Company one. Most have no idea who he was assembly date and was cast in mold! Build date usually a casting tool change, or some physical change Speed but... The internals are installed in the inner ring of the largest companies of main cases, tailshaft housings, side... That time period will say us Patent no 3088336, virtually all Muncie had! The slotted rings in the sides of the largest companies standard 10-spline input assembly! Guys at Anaheim gear tell us there are a few different types of Muncie 4 Speed transmission,!, heavy-duty Set with a pin that runs through its center so glad I with. Box you want perhaps it is made of a design change or put... People reading this book will never see some of our parts which are in. That was originally filed on November muncie 4 speed m22, 1957, for the T10/Muncie was. Gm divisions may also use different extensions with the same main case castings Pro Super N24 HEAVY DUTY case. To a 3851325 case, manufactured may 1964, shows a Patent number is documented actual... Was switched you have to remove the side cover to see what 's inside standard. Together from parts was exclusive a small block tag numbers W logo ora part. Screw and Bolt Company, one of the transmission clutch area are located in the sides of the gears...