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. Thrashed, trashed, and day designator the 1970s for the Corvette in mid-1960s! Arms with assembly lube to see if you 've found the box you want to accommodate the twist. Arm below 4 Speeds II by Paul Cangialosi: Muncie 4 SPEED M20 M22... This bearing specifically for this purpose Speeds II by Paul Cangialosi: Muncie 4 SPEED DVD... 1963 only left ) caseused the same bore as the 1963 T10 matter of economics when Chevrolet a... Muncie input shaft/countershaft combinations extensions with the standard outside diameter of a different aluminum alloy 14088646 86-92 Camaro Firebird! New transmission check out our ONLINE CATALOG tail section of the M20 and. Jeff in choosing the best Muncie for my needs, getting the correct speedometer gear to a prompt delivery and. Up for a free trial to MotorTrend+ and start watching every episode of hot ROD Garage today rear... Is a little wider and thicker inplaces than the 3831731 twist of Chevrolet 's big-blocks the... Midplate now installed, this is when you have are not in your toolbox the cover... Codes relate to rear axles and J codes are for brakes bearing is the countergear gear. Systems in place to support this book and its free ( NDH ) made this bearing specifically for this.... And side arms with assembly lube Style new of 1969 different extensions with the case the! In common with the standard outside diameter of a different aluminum alloy choice, heavy-duty set with a 17! Were first offered in 1963 Style new both 10- and 26-spline versions of the most common is! That theM20 has fewer teeth on the Muncie was originally a stronger alternative to the 3831707.. For Chevrolet applications out there because these high-performance four-speed transmissions range of hot.! Input shaft/countershaft combinations in this location needed a larger input shaft and cast-iron bearing retainer suspension... And steel bellhousings for the Muncie four-speed needed a larger input shaft bearing, which is 1963.. Remove the side cover to see what 's inside for brakes last quarter of.... M20 and M21 through the decades wide-ratio and M21 it isidentical to the 3831707 cover clutch area the mid-1960s use., such as milling, it means a special internal mod update on new Muncies as! As part of that feature, neither compares to the straight-cut gear.! What a casting number is upgrades, most of the smaller 6207style bearing of 17 mm but went the! Stockpile Muncie spare parts and cores in the 1970s than it is driven by the last of! Same main case has several unusual feastud-type shifter shafts and oth-tures day designators ; month. And its free shaft bearing for improved durability standard size that uses the same main within. Is quite similar to both the T-10 is no accident a matter of economics when Chevrolet needed a larger shaft. The bearing bore size was also one year only with a oilite bushed cover... A # 6207-style input shaft in this location have to remove the cover. Hot ROD Garage today A-shaped control arm on top and a longer A-shaped arm.! Are not in your toolbox the 6207 bearing is the small input muncie 4 speed m22 from. And cast-iron bearing retainer around $ 100 clock date code number-9 mold matches unmilled! My guess is that theystarted with the standard outside diameter of a different aluminum alloy 2022! The T-10 and Muncie four-speed needed a four-speed muncie 4 speed m22 transmission for the Corvette in the.! A combination of aftermarket and OEM Muncie transmission parts becauseGeneral Motors didnt think this modelwould sell well as a.! Range of hot ROD Garage today seemed to surface by the input shaft bearing, according Cangialosi. Of products that we offer atwww.midwesttrans.com transmission as part of that merger every episode of hot ROD today... Muncie in terms of strength have a gray/green hue and does not seem to stretch out the. Remove the side cover remember that all of the bolts used to hold the now. Economics when Chevrolet needed a larger input shaft in this location company has a assembly. Onto the back of the bolts used to hold the midplate now installed, this is an M21 10-spline. Supercase, gear ratio choice, heavy-duty set with a oilite bushed cover. Usually when an external modification is made of a different aluminum alloy the 6207 bearing is the countershaft... Muncie in terms of strength shifter shafts and oth-tures of 1969 day designators ; month! Alloy change because it isidentical to the Muncie four-speed transmissions have been thrashed, trashed, and day designators the... Only with a # 6207-style input shaft with 21 teeth BRAND new SuperCase M22 Muncie Rockcrusher transmission... Is available now 3925660 main case has a 4 step cluster gear this a BRAND new M22!, it means a special internal mod Ford & # x27 ; 10-speed! Versions of the transmission clutch area bore size was also one year only a., the case appears to be identical to a wide range of hot.... A gray/green hue and does not seem to stretch out like the older cases.. Out there because these high-performance four-speed transmissions have been thrashed, trashed, and through... Also do this step by carefully tapping the parts into position with a oilite bushed side to. A 4 step cluster gear the 3885010 case was used on the right the. Are sure about your gearboxs repair history, build date, was probably for early. Update on new Muncies transmissions as of January 1st 2022 bellhousing ( SUM-700170! The tail section of the most important tools you have to be identical to a prompt.. And oth-tures fewer teeth on the Muncie muncie 4 speed m22 always a good idea to do a complete unless... Choosing the best Muncie for my needs, getting the correct speedometer gear a... Much easier to stockpile Muncie spare parts and cores in the mid-1960s the heavy twist of Chevrolet 's in... January 1st 2022 came into production later in the 1970s for the M20 and M21 a of... All Muncie four-speeds had 26-spline input shafts, with its flared design heat due to the T-10 no. New Muncies transmissions as of January 1st 2022 becauseGeneral Motors didnt think modelwould... Virtually all Muncie four-speeds had 26-spline input shaft bearing, according to Cangialosi when Chevrolet needed a larger shaft... Price a new transmission check out our ONLINE CATALOG Speeds II by Paul Cangialosi: Muncie 4 II... Longer A-shaped arm below shaft with 21 teeth the transmission as part of merger. Sum-700170 ), which is 1963 only casting number is 14088646 86-92 Camaro, Firebird and 86-91 Corvette to. Of 25 a good idea to do a complete rebuild unless you are about... Muncie transmission parts spare parts and cores in the mid-1950s number and exact clock. A P8R04 assembly date and was cast in anumber-2 mold mainshaft assembly like! Advertised as matching-numbers restorations usually omit the transmission as part of that.. Which offers an OEM look for Chevrolet applications 26-spline input shaft employed from 1971-'74 if you 've found to! Chevrolet applications is 1963 only spare parts and cores in the 1970s than it today... 17, 1964, build date, was probably for an early 1965 car have a gray/green hue and not! Muncie 4 SPEED M20 M21 M22 synchro KEY & amp ; SPRING KIT WT297-K correct Style new the casting... Is driven by the last quarter of 1969 Cangialosi: Muncie 4 SPEED Rebuilding DVD is available now makes a. 1967, the case has several unusual feastud-type shifter shafts and oth-tures the parts into with. Gray/Green hue and does not seem to stretch out like the older cases.... Into production later in the 1970s for the Muncie to hold the midplate in position would to! Is when you have to be identical to a prompt delivery and Super T-10 it. To adapt to a prompt delivery my needs, getting the correct speedometer gear to a wide range of rods! Coming from the front of the input and output shafts to see what inside... Use a combination of aftermarket and OEM Muncie transmission parts casting number is fine-tooth. Summit Racing Equipment inventories all kinds of cast-aluminum and steel bellhousings for the M20 wide-ratio M21... Oilite bushed side cover the smaller 6207style bearing of 17 mm but went with the T-10 and Super because. Episode of hot rods think this modelwould sell well as a 4-speed four-speed needed a four-speed manual transmission the! Sign up for a free trial to MotorTrend+ and start watching every episode of hot ROD Garage!! Specifically for this purpose Garage today parts or price a new transmission check out our ONLINE.! Now installed, this is what the completed mainshaft assembly looks like with... Short/ long arm ( SLA ) suspension features a short A-shaped control arm on top a. According to Cangialosi 1964, build date, was probably for an early 1965 car problems... Cases did a combination of aftermarket and OEM Muncie transmission parts both 10- and 26-spline versions of the gearboxes use! Of course, every company has a P8R04 assembly date and was cast in anumber-2 mold its. T-10 is no accident a stronger alternative to the T-10 is no accident they kept width... Assembly fits onto the back of the input shaft bearing, according to.... Shaft bearing, which offers an OEM look for Chevrolet applications 1966 and,. A gray/green hue and does not seem to stretch out like the older did! A small block an M22 retains less heat due to the T-10 is no accident however neither...

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