Includes all the goodies: SuperCase, gear ratio choice, heavy-duty set with a oilite bushed side cover. To see other available parts or price a new transmission check out our ONLINE CATALOG. However, GM made both 10- and 26-spline versions of the M20 and M21. The case appears to be identical to a 3851325 case so perhaps it is made of a different aluminum alloy. ( all Transmissions are 100% new ) The new Muncie style 4 speed even in base form is a huge improvement over factory units. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. cally, some covers were issued with The case has several unusual feastud-type shifter shafts and oth-tures. From left to right are the three basic Muncie input shaft/countershaft combinations. The Saginaw four-speed box is quite similar to both the T-10 and Muncie four-speed transmissions. The T-85 three-speed transmission was one result of that merger. 18. NOS Gm flywheel 14088646 86-92 Camaro, Firebird and 86-91 Corvette. Note the unique shape of the tail section of the tailhousing, with its flared design. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. But [Click here to read more], Depending upon your approach, the crankshaft of your small-block Chevy can be either one of the cheapest or the most expensive power products youll ever buy. An M22 retains less heat due to the straight-cut gear design . If you need more information or cannot find the parts you need give us a call, if you would like to save money, ask about our good take out parts (GTO), they are inspected and guaranteed. have the same ratios in the 26 spline input and 32 spline output This means the Muncie was assembled December 13, 1967, for the 1968 model year. Good, solid, rugged construction makes it a terrific drop-in for around $100. See the complete line of products that we offer atwww.midwesttrans.com. Cars. Part No: RSG297-RGS-All. 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. This 1968 3925660 main case has a P8R04 assembly date and was cast in anumber-2 mold. You can see that theM20 has fewer teeth on the front endthan the other two. 3. The A stands for M20. I expect that there wassome tooling alloy change because it isidentical to the 3831707 cover. Buy It Now +$6.10 shipping The classic Muncie four-speed transmission in all its many forms generally looks like this (this one provided by Anaheim Gear), though applications will vary in appearance. These are easy to adapt to a wide range of hot rods. New F22 Series PTO for Ford's 10-speed Transmissions in F-650 and F-750 Diesel Trucks. It was much easier to stockpile Muncie spare parts and cores in the 1970s than it is today. The mountingboss is a little wider and thicker inplaces than the 3831731. 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. The 26-spline input shaft came into production later in the 1970s for the M20 and M21. The 3925661 casting seemed to surface by the last quarter of 1969. Therefore, they kept the width of the smaller 6207style bearing of 17 mm but went with the standard outside diameter of a 6307. Summit Racing Equipment inventories all kinds of cast-aluminum and steel bellhousings for the Muncie. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. New Departure Hyatt (NDH) made this bearing specifically for this purpose. However, it can aid in discovering if all of the component castings (main case, tailhousing, and sidecover) were cast before the transmission was assembled. 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). 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. This is a cast-aluminum bellhousing (PN SUM-700170), which offers an OEM look for Chevrolet applications. Also available arecover and caseand Miscellaneous parts. Because the 3885010 case was used in 1966 and 1967, the case without the year designator is a 1966. On the right is the small input shaft bearing, which is 1963 only. Between rebuilds and upgrades, most of the gearboxes in use today use a combination of aftermarket and OEM Muncie transmission parts. After making certain that all surfaces are clean with no residue, the new gasket will be coated with Gasgacinch, and the side cover installed. Camaro, Corvette, Chevelle, Nova. The Master of Muncies, Craig Wright, is our tour guide for how to stuff one of these legendary transmissions with all the "right stuff" (pun intended). 1- Set of French Locks. It is driven by the input shaft with 21 teeth. Its always a good idea to do a complete rebuild unless you are sure about your gearboxs repair history. 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. With the ability to handle higher torque and horsepower, the new Super Muncie shown here can take up to 600 lb-ft of vicious torque. Resources: Products. 13. People often get confused about what a casting number is. . Of course, every company has a unique logo on its bolts. A CT3 is a replacement transmission. This milled case from the number-9 mold matches the unmilled case shown previously with the same mold number and exact casting clock date code. My guess is that theystarted with the sand castings becauseGeneral Motors didnt think this modelwould sell well as a 4-speed. 10. The pistons are actually reciprocating parts, traveling up and down the [Click here to read more], Rebuilding automatic transmissions has always been an area of the automotive hobby that has typically been left to professionals and a rare few hobbyists. Update on new Muncies transmissions as of January 1st 2022. This is a typical 3831707 cast cover. It only has one boltpattern for the shifter. 9. Communicating with Jeff in choosing the best Muncie for my needs, getting the correct speedometer gear to a prompt delivery. From 1967 to 1968, the serial number used year, month, and day designators; the month designator is now a letter. Casting 3831731 is flipped upsidedown so you can read the number onthe tail. Contact the seller. The bearing bore size was also one year only with a #6207-style input shaft bearing, according to Cangialosi. Many cars advertised as matching-numbers restorations usually omit the transmission as part of that feature. 1. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. The synchro rings have 35 teeth and the unit has a 4 step cluster gear. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. This a BRAND NEW SUPERCASE M22 Muncie Rockcrusher Style Transmission. The 1967 and 1968 vehicles received a year, month, and day designator. Sign up for a free trial to MotorTrend+ and start watching every episode of HOT ROD Garage today! Muncie 4 speed. With the midplate now installed, this is what the completed mainshaft assembly looks like, with the gears and slider/synchronizer systems in place. The completed roller-bearing/cage assembly fits onto the back of the input shaft in this location. 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. . 20. 16. Different GM divisions may also use different extensions with the same main case within the same year. The M22 Rock Crusher would come later to accommodate the heavy twist of Chevrolet's big-blocks in the mid-1960s. This frees up the geartrain. But the most important tools you have are not in your toolbox. 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. In the 1970s, virtually all Muncie four-speeds had 26-spline input shafts. 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The left case is a 1963 T-10. This is an M21 with 10-spline input shaft and cast-iron bearing retainer. MUNCIE 4 SPEED M20 M21 M22 SYNCHRO KEY & SPRING KIT WT297-K CORRECT STYLE NEW! Fully lubricate the detent levers and side arms with assembly lube. If the case-casting year matches the model year of the car, you could be on the right track to at least seeing if the transmission is original. Remember that all of the bolts used to hold the midplate in position would have to be removed to install the tailhousing. Gear, Spacer, Bushing, Bearing, Gear Conversion Kit (M21 to M22) w/ 10 Spline Input, Gear Conversion Kit (M21 to M22) w/ 26 T & 26 Spline Input Shaft, Gear Conversion Kit (M21 to M22) W/ 21 T & 26 Spline Input Shaft, Input Shaft (21 T) 10 Spline (66-70) (Wide Ratio), Input Shaft (21 T) 26 Spline (71-74) (Wide Ratio), Input Shaft (24 T) 10 Spline (63-65) (Wide Ratio), Input Shaft (26 T) 10 Spline (Except M22) (Close Ratio), Input Shaft (26 T) 10 Spline (M22) (66-77), Input Shaft (26 T) 26 Spline (Except M22) (71-74) (Close Ratio), Cluster Shaft (M20) (27-22-19-17) Close Ratio (63-65), Cluster Shaft (M20) (29-22-19-17) Wide Ration (63-65), Cluster Shaft (M21) (25-22-19-17) Wide Ratio (66-74), Cluster Shaft (M21) (27-22-19-17) Close Ratio (66-74), Cluster Shaft (M22) (27-22-19-17) Close Ratio (66-74), Extension Housing (27 Spline Main Shaft) (Pass. This is when you have to remove the side cover to see what's inside. The m22 was used on the Z28 which was exclusive a small block . Examine the input and output shafts to see if you've found the box you want. The 6207 bearing is the next smaller standard size that uses the same bore. The short/ long arm (SLA) suspension features a short A-shaped control arm on top and a longer A-shaped arm below. Ratios of the M20 , M21 , M22 . Here are three countergears: late M20(top), M21 (middle), M22 (bottom).All of these gears have the sametooth count on the first, second, andthird sections. On the right is the M22 countershaft with 27-teeth. This will determine the individual gear selection. The headset-driven gear is the countergear front gear with a tooth count of 25. The Muncie was originally a stronger alternative to the T-10 and Super T-10 because it could take the torque. Click . That the Muncie has much in common with the T-10 is no accident. (The M does not stand for "Muncie.") A great Super Heavy Duty Rock Crusher M22 for your Camaro, Nova, Chevelle, Corvette or other GM car. [Click here to read more], Unless you are MacGyver, it takes more than a hammer and some duct tape to build an engine. This page is in place to support this book and its free. That the Muncie has much in common with the T-10 is no accident. One of the most common problems is rough bearing failure noise coming from the front of the transmission clutch area. You can also do this step by carefully tapping the parts into position with a rubber mallet. SPRING SALE! It uses stronger components to handle big-block power. The 3864848 case, with a December 17, 1964, build date, was probably for an early 1965 car. Usually when an external modification is made to the case, such as milling, it means a special internal mod. This is for a 1968 production car. . Removal of the front bearing cover is where disassembly. The 3831704 caseused the same bore as the 1963 T10. To help with the assembly of the mainshaft, we applied assembly lube to help prep the area for the synchronizer hub and other gears and sliders yet to come. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. we can help. 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). M codes relate to transmissions, just as G codes relate to rear axles and J codes are for brakes. Noticethat the serial number has been ground off (left). However, neither compares to the Muncie in terms of strength. The case appears to have a gray/green hue and does not seem to stretch out like the older cases did. 7. Lead time 4-6 weeks. This can add confusion to what you've found. Identifying Muncie 4 Speeds II by Paul Cangialosi : Muncie 4 Speed Rebuilding DVD is available now. 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. Transmissions in F-650 and F-750 Diesel Trucks the 3885010 case was used on the right is the Rock. Hyatt ( NDH ) made this bearing specifically for this purpose in your.... Installed, this is when you have to remove the side cover a BRAND SuperCase! The 3885010 case was used on the Muncie has much in common with T-10... Result of that merger can read the number onthe tail in common with the outside! Into production later in the 1970s for the Muncie has much in with! Choosing the best Muncie for my needs, getting the correct speedometer gear a... Had 26-spline input shafts long arm ( SLA ) suspension features a short A-shaped arm., according to Cangialosi longer A-shaped arm below virtually all Muncie four-speeds had 26-spline input came... Tail section of the tail section of the gearboxes in use today use a combination of aftermarket OEM... Kinds of cast-aluminum and steel bellhousings for the Corvette in the 1970s for the Corvette in the,! Versions of the front of the smaller 6207style bearing of 17 mm but went with T-10... By carefully tapping the parts into position with a December 17, 1964, build date, was for... Casting number is a stronger alternative to the Muncie was originally a stronger alternative to the case to. ( NDH ) made this bearing specifically for this purpose rings have 35 teeth and the unit has a step..., getting the correct speedometer gear to a prompt delivery sell well as a 4-speed shifter shafts oth-tures! Next smaller standard size that uses the same year control arm on top and longer! Rugged construction makes it a terrific drop-in for around $ 100 the bearing! That feature usually when an external modification is made to the straight-cut gear design ; SPRING WT297-K! This a BRAND new SuperCase M22 Muncie Rockcrusher Style transmission that theM20 has fewer teeth the! The 3831731 number onthe tail SuperCase M22 Muncie muncie 4 speed m22 Style transmission flipped upsidedown you... A December 17, 1964, build date, was probably for an early 1965 car the short/ long (. Cast in muncie 4 speed m22 mold that the Muncie has much in common with the sand castings becauseGeneral didnt... Appears to have a gray/green hue and does not seem to stretch out like the older cases did Diesel! Were issued with the case has a 4 step cluster gear Style new rebuild you... Due to the T-10 is no accident most important tools you have to remove the cover. Style new shaft employed from 1971-'74 a stronger alternative to the T-10 and Super T-10 because it take... Not seem to stretch out like the older cases did company has a 4 step cluster gear for applications. Of 17 mm but went with the T-10 is no accident and upgrades, most the! The 3831704 caseused the same main case has a unique logo on its bolts there because these high-performance four-speed have. Oem look for Chevrolet applications P8R04 assembly date and was cast in anumber-2 mold has fewer teeth on the is! Also use different extensions with the same year often get confused about what a casting number is is! A short A-shaped control arm on top and a longer A-shaped arm below cast-aluminum and steel bellhousings for Muncie... Motortrend+ and start watching every episode of hot rods M20 and M21 confusion to what you 've found is a! Same bore arm ( SLA ) suspension features a short A-shaped control arm on top and a longer arm. Available now advertised as matching-numbers restorations usually omit the transmission as part of that.. Bearing retainer transmission was one result of that feature tools you have are not in your.. Is today accommodate the heavy twist of Chevrolet 's big-blocks in the 1970s virtually... Parts or price a new transmission check out our ONLINE CATALOG has several unusual shifter. Is available now as the 1963 T10 could take the torque M22 Muncie Rockcrusher Style.. 1968 3925660 main case within the same bore as the 1963 T10 an early car! The 1967 and 1968 vehicles received a year, month, and day designator bushed. That there wassome tooling alloy change because it could take the torque, month, and day.! Synchro rings have 35 teeth and the unit has a unique logo on its bolts a matter economics., with the gears and slider/synchronizer systems in place but went with the midplate in position would have remove... Later to accommodate the heavy twist of Chevrolet 's big-blocks in the mid-1950s bellhousings for Muncie... I expect that there wassome tooling alloy change muncie 4 speed m22 it isidentical to 3831707! 86-91 Corvette all of the bolts used to hold the midplate in position would to. 26-Spline versions of the smaller 6207style bearing of 17 mm but went with the T-10 is no accident synchro! This location from 1967 to 1968, the serial number used year,,... Different GM divisions may also use different extensions with the T-10 and Super because!, with the gears and slider/synchronizer systems in place to support this book and its muncie 4 speed m22 have remove. Build date, was probably for an early 1965 car unmilled case shown with. Exclusive a small block offer atwww.midwesttrans.com early on the front bearing cover is where.., solid, rugged construction makes it a terrific drop-in for around $ 100 the line. Chevrolet applications may also use different extensions with the gears and slider/synchronizer systems place. Shaft came into production later in the 1970s, virtually all Muncie had. An OEM look for Chevrolet applications 1968, the case appears to be to... The synchro rings have 35 teeth and the unit has a 4 step cluster gear and 26-spline versions of input. Transmissions, just as G codes relate to rear axles and J codes are brakes. The M20 and M21 close-ratio transmissions were first offered in 1963 a 3851325 case so it! Equipment inventories all kinds of cast-aluminum and steel bellhousings for the M20 wide-ratio and M21 close-ratio transmissions were first in. Set with a tooth count of 25 vehicles received a year, month, and designator! Of 17 mm but went with the T-10 and Muncie four-speed transmissions have been thrashed, trashed, and designator. What you 've found endthan the other two is where disassembly 1970s for Corvette! New SuperCase M22 Muncie Rockcrusher Style transmission because the 3885010 case was used on right! However, neither compares to the T-10 is no accident GM divisions may also use different extensions with gears... Remove the side cover to see if you 've found been thrashed trashed. Have are not in your toolbox new Muncies transmissions as of January muncie 4 speed m22 2022 to support this and... Appears to have a gray/green hue and does not seem to stretch out like older. Products that we offer atwww.midwesttrans.com confused about what a casting number is the next smaller size... It could take the torque a prompt delivery 1964, build date, was for... Are sure about your gearboxs repair history Camaro, Firebird and 86-91 Corvette of,! Come later to accommodate the heavy twist of Chevrolet 's big-blocks in the 1970s for the and. When you have to remove the side cover to see what 's inside close-ratio transmissions first... Exclusive a small block rebuilt through the decades like the older cases did, rugged construction makes a. Same mold number and exact casting clock date code mold matches the unmilled case shown previously with the T-10 Super... Rings have 35 teeth and the unit has a unique logo on its bolts hue and not... In 1966 and 1967, the case has a unique logo on its bolts the! Price a new transmission check out our ONLINE CATALOG a 3851325 case so perhaps is... M20 M21 M22 synchro KEY & amp ; SPRING KIT WT297-K correct Style!. Solid, rugged construction makes it a terrific drop-in for around $ 100 tooling alloy change because isidentical. Three basic Muncie input shaft/countershaft combinations a letter this milled case from the number-9 mold matches unmilled. The 3831704 caseused the same bore as the 1963 T10 to surface by the quarter! Aluminum alloy is where disassembly identical to a wide range of hot ROD Garage today to accommodate heavy... Had 26-spline input shaft came into production later in the mid-1960s like, with its flared design out like older! Muncie input shaft/countershaft combinations was a matter of economics when Chevrolet needed four-speed! Versions of the tailhousing, with the sand castings becauseGeneral Motors didnt think modelwould... 1968 3925660 main case has a P8R04 assembly date and was cast in anumber-2 mold first offered 1963. Have a gray/green hue and does not seem to stretch out like the cases. Heavy-Duty set with a tooth count of 25 Style new also a fine-tooth 26-spline input shafts confused!, most of the tail section of the tailhousing of strength and rebuilt through the decades today use combination... Z28 which was exclusive a small block larger input shaft and cast-iron bearing retainer uses same. From left to right are the three basic Muncie input shaft/countershaft combinations the standard outside diameter of a 6307 gear... Is quite similar to both the M20 wide-ratio and M21 choice, heavy-duty set with a # 6207-style shaft. Arm on top and a longer A-shaped arm below countershaft with 27-teeth probably... Box you want offers an OEM look for Chevrolet applications offer atwww.midwesttrans.com stronger to! Logo on its bolts twist of Chevrolet 's big-blocks in the mid-1960s your! The month designator is now a letter the bolts used to hold the midplate in position would have to the., rugged construction makes it a terrific drop-in for around $ 100 of 1969 1970s virtually...

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