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. Main Remember that nothing smaller than 350 ci is worth building. Each new SuperCase transmission is built from the highest quality available. It appears that more milled cases are in circulation compared to unmilled cases. Black Nylon. Contrary to popular belief, you cannot tell a 4-speed Muncie is an M22 by looking at the input shaft splines. You can obtain Cases are either small-bearing (1963) or large-bearing (1964-'74). 8. You can use a variety of stock and aftermarket shifters on any of the Muncie tailshaft housings. Untouched survivor Muncies are rare; so are the ones that have correct correlating casting and serial numbers. Wide Ratio = 2.56-1st, 1.75-2nd, 1.36-3rd, 4th direct Built for big HP. Free shipping for many products! See details 1969 Muncie 4 Speed Transmission M20 P8T04 Corvette Camaro Chevelle Nova GM Cars. SPRING SALE!!! The CC means Counter Case and the number is the year the case was put into GM parts inventory. This usually indicates that the gears used in the milled cases might be of a different steel alloy. . Casting 3857584 is pretty muchidentical to the wide-fin 3846429tail. NEW Muncie M22 SUPER ROCK CRUSHER 4 speed $2399.00 View Images CURRENTLY UNAVAILABLE UNTIL SPRING-TAKING ORDERS $2399.00 PLUS S/H + ASSEMBLY FEE of $225.00 OPTIONS YOU CAN ADD: $150.00 MICRO SUPER FINISH $35.00 THRUST BUTTON FOR HEAVY LAUNCH AND DOWNSHIFT CASE SUPPORT SUPER ROCK CRUSHER M22 650 HP CALL for orders NEW Direct replacement M22 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. Its still a good habit to double-check the gears to confirm the ratio because often the ratios were switched around. I have bought two, and my buddy will be . Some cases may look identical and have a different casting number but have the same GM part number. Year Make Model Trim Engine Add vehicle Muncie M-22 Rock Crusher Four Speed Transmission - RARE Drivers Side Speedo Refurbished Examine the input and output shafts to see if you've found the box you want. 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. Trans is perfect, and Im so glad I went with this seller. Check if this part fits your . The 26-spline input shaft yields greater torque capacity via the number of teeth and greater surface area. Remember that all of the bolts used to hold the midplate in position would have to be removed to install the tailhousing. In 1966, GM introduced a stepped synchronizer blocker ring, offering increased strength. From left to right, early M20, M21, later M20, and M22. 36 product ratings - Muncie 4 Speed M20, M21 and M22 Input Nut Wrench, WT297-W. $18.95. 20. Ultra Pro Super N24 Heavy Duty Muncie 4-Speed. A gear ratio is a combination of two ratios multiplied together. A=M20 B=M21, C=M22). 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). It is a later casting design with ers with bolt-on shifter shafts. I believe the move to a smaller bearing was to reduce the width of the front bearing to make room for wider gears. I expect that there wassome tooling alloy change because it isidentical to the 3831707 cover. Bumper & Fender Apron Nylon "U" Nut. Sort by. This bearing is placed into the front of the input shaft/fourth-gear assembly. 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. 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 See all 2 refurbished listings. The M22 Rock Crusher followed four years later. Muncie four-speeds were produced in two different ratios: the wide ratio (M20) and the close-ratio (M21). Muncie RPO Codes Just three types of Muncie 4-speeds are available based on the RPO (regular production option) code used when a car was ordered: the M20 (standard wide-ratio), M21 (close-ratio), and M22 (heavy-duty close-ratio). This a BRAND NEW SUPERCASE M22 Muncie Rockcrusher Style Transmission. 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. Casting 3846429 is a wide-fin casting.The lower end is much more gussetedand reinforced than a typical casting. 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. Their number was 41307B. However, the 19641965 3851325 casting number waskept, as was the 7/8-inch countershaftbore. Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. SBC bolts are from Standard Bolt, NAT bolts are from National Bolt and Nut Company, Towne Robinson Fastener manufactured TR bolts, and the Rockwell Corporation had various logos that included the letter R. Some other logos you might come across are KS, RSC, and D. Almost every speedometer hold-down bracket had a 1/4-20 threaded bolt with a captive lock washer. Retaining the 4-speed with your LS swap is a perfect blend of old and new. Because the Muncie was really GMs design improvement of the T10, the 7/8-inch-diameter counter-shaft was also used in 1963. 16. These are easy to adapt to a wide range of hot rods. Click . Looking for a Muncie shifter engineered to fit within your budget? Kit includes: SUPER CASE, SUPER TAIL, SUPER SIDE COVER, ALUM MID PLATE, LIGHTENED MAIN SHAFT, HD ITALIAN GEAR SET, HUBS, SLIDERS, BRASS RINGS, WELDED SHIFT SHAFTS, SHIFT FORKS, HD BEARINGS, REVERSE GEARS, REV FORK, REV SHIFT SHAFT, INPUT BEARING, BEARING RETAINER, LOCK NUT, CLUSTER PIN, NEEDLE BEARING THRUST WASHERS, SNAP RINGS, SPEEDO GEAR PARTS, TAIL VENT, BOLTS AND GASKETS ETC. When you have the two side-by-side it becomes obvious which is which. Cases are either small-bearing (1963) or large-bearing (1964-'74). Its identical tothe 3831704, except it had a biggerfront bearing bore. Date code format for 19631966 model years was just a month and day. Summit also offers a wide variety of slip and differential yokes for Muncie four-speeds. This means a 4.10:1 rearend gear-ratio can be effectively changed to 3.19:1 gearing with the flip of a switch. Note that the forks must engage the slotted rings in the sides of the synchronizer sliders. Four are late model. To speak to a Drive Train Expert or to place an order call toll free888-824-2012! SPRING SALE!!! The synchro rings have 35 teeth and the unit has a 4 step cluster gear. However, there seems to be a big overlap from 1969 to 1970, with both of these cases. If it's original to the car it will have some identifying #s on it . Also available arecover and caseand Miscellaneous parts. Multiple ratios, Heavy Duty case, center plate and tail. CALL JEFF (262)893-9812 for details. 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). Here are some 26-spline input shafts.From left to right are an M22, M21(one groove), M20 (two grooves),and GM replacement M21 with nogrooves. Counter Shaft Pin), M21 M22 (66-74) (1 Dia. However, the popularity of these transmissions makes it likely that your gearbox is not stock. 1-Counter Shaft Pin 1" The cases offer a broad range of interchangeability. Note the single groove, meaning an M21 close-ratio. 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. have the same ratios in the 26 spline input and 32 spline output 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. Cars. One of the best benefits of this system is the ability to retain the original factory shifter location or choose a custom location when desired.. 1974. Reliable sources to validate information regarding serial and casting numbers will get scarcer as time passes. In fact, 1963 is a standalone year because changes in this box came almost immediately for 1964, beginning with the front bearing retainer, which was aluminum for 1963 and became cast-iron in 1964. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. Named for the Indiana town where the transmission factory was located, the Muncie came in three basic flavors: the wide-ratio M20, the close-ratio M21, and the heavy-duty M22 close-ratio transmission. This 1968 3925660 main case has a P8R04 assembly date and was cast in anumber-2 mold. Opens in a new window or tab. 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. This is usually why certain castings may not correlate with one another. Jeff and midwest muncie , was a pleasure to deal with . The 1967 and 1968 vehicles received a year, month, and day designator. Tailshaft housings will vary based on original application. 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. Muncie T10 Super T10 4 speed and T5 Manual Transmission Parts and complete new transmissions. The 26-spline input shaft came into production later in the 1970s for the M20 and M21. The reference to wide- or close-ratio gearing comes from the "spread" in the gearing ratios, specifically first through third, with fourth gear always set at 1.00:1. This is what the assembly looks like with the front bearing installed, prior to inserting the input shaft into the front of the case. Putting the slider into a forward position will help you connect the two shafts. The cheapest offer starts at $ 3,500. Tailhousings often get damaged where the reverse shifter shaft lock pin sits, and at both the shifter and main mount bolt-boss locations. Muncie transmissions from 1971-'74 have the larger 32-spline output shaft. The progression of the 10-spline input identification groove system. Most all the weak points of an original Muncie have been solved by the Super-Case design. Some people dont even have a Muncie. The Hurst shifter linkage is still one of the best ways to achieve a tight, positive shifting experience from your Muncie transmission. 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. This is listed as PN-SL24229 from Wright Connection Speed & Gear. By late 1963 the rare 3839606 case started to show up in cars with a larger bearing bore. Update on new Muncies transmissions as of January 1st 2022. The first Muncie case was number 3831704. However, it is thinner by 4 mm and smaller in diameter by 8 mm. Two are early style side covers. Most of thesecastings look very rough. The bearing bore size was also one year only with a #6207-style input shaft bearing, according to Cangialosi. As a mold is poured, date-coded clocks are cast into most cases that represent the month, week, and sometimes day the case was cast. This is a BEEFY version of the original Rock Crusher transmission. The 6307N bearing has a 35-mm bore, an 80-mm outside diameter, and is 21 mm thick. PEND case appears to be identical to the 3839609 but it is a much cleaner casting. Free shipping for many products! The number represents the month and the dots represent the week. 73 corvette coupe . Here are three rules that will help you determine which transmission you have: Muncie countergears had the same number of teeth on first-, second-, and third-speed sections. This meant that the transmissions front bearing retainer and register bore of the bellhousing were also smaller in diameter. Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. (Photo Courtesy Ed Hartnett). Because the Muncie has so much in common with the T-10 and even similar Saginaw boxes, it is easy to get this guy mixed up with non-Muncie units. It is unique to the Muncie and was used until the very end of production in all main cases with the exception of the 3831704 case. ( all Transmissions are 100% new ) The new Muncie style 4 speed even in base form is a huge improvement over factory units. Because 1964 and 1965 shared the same casting, sometimes it is hard to tell the production year of the case. This is the standard Muncie 4-speedcase. Most of the time the other cloc is blank, but occasionally it represents numbers and deviations to the original blueprint. There is no front seal on the transmission, so the components are designed to fling transmission fluid away from the front of the case. My Account. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. Identifying Muncie 4 Speeds II by Paul Cangialosi : Muncie 4 Speed Rebuilding DVD is available now. Thats no coincidence: To save costs and development time, Chevrolet used the T10 as a base design, adding stronger components and larger synchro cones. Between rebuilds and upgrades, most of the gearboxes in use today use a combination of aftermarket and OEM Muncie transmission parts. This is called a narrow 6307 bearing (PN N307LOE). You would think that in nectors. Some of the best Muncie builders participate on that page. He tells us both the M20 wide-ratio and M21 close-ratio transmissions were first offered in 1963. a new transmission as a standard replacement unit with a 10 spline Year 1963-1965 Type: M20 Rings: None Ratio: 2.56 / 1.91 / 1.48 / 1.00 / 3.16 You're going to find various combinations of main cases, tailshaft housings, and side covers coupled with variations inside of each case. 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. Of course, restorers and rebuilders will tend to re-stamp the date code to suit a particular restoration. Several times a day Im asked, by email or phone, how to identify a Muncie. Part No: RSG297-MSSGTK. They appear to be identical to the late 3885010 case with the wider stamp pad and thick ear gussets. This case was used to the end of 1967. Although the Muncie's bloodline goes way back, this legendary gearbox entered service for the Chevrolet Division in 1963. Most synchro failure is caused by poor clutch adjustment. By changing the ratio of just the head set (input shaft and front of the countergear) you can change the overall ratio. It is the heavy-duty version of the 2.20:1 ratio M21 four-speed. Counter Shaft Pin), Small Parts Kit (7/8 OD Counter Shaft) (M20), Small Parts Kit (1 OD Counter Shaft) (M21 M22), Transmission Conversion Kit (Complete) (M21 to M22), Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD), Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD) Max load, 1-2 Synchro Ring (Early, Non-Stepped Shoulder), 1-2 Synchro Ring (Late, Stepped Shoulder), 3-4 Synchro Ring (Early, Non-Stepped Shoulder), 3-4 Synchro Ring (Late, Stepped Shoulder), M20 (10 Spline, 7/8 Counter Shaft) Wide Ratio 2.56 1st Gear, M20 (10 Spline, 1 Counter Shaft) Wide Ratio 2.52 1st Gear, M20 (26 1 Counter Shaft) Wide Ratio 2.42 1st Gear, M21 (10 Spline 7/8 Counter Shaft) Close Ratio 2.20 1st Gear, M21 (10 Spline 1 Counter Shaft) Close Ratio 2.20 1st Gear, M21 (26 Spline 1 Counter Shaft) Close Ratio 2.20 1st Gear, M22 (1st Gear Kit) Updated Incl. One of the most common swaps involves a Muncie 4-speed. . This 3925661 case has a CC3 numberof 42198. 5. Main cases manufactured prior to May 7, 1963, will say Patent Pending. Not every step is as simple as sliding on the part. 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. On the left is the M20 countershaft, which is easily identified by the larger 29-tooth gear. All ball bearings have standardized numbers used by the bearing industry. 12. Most all. Examine the input and output shafts to see if you've found the box you want. Looking for a Muncie shifter engineered to fit within your budget? 15. Here's another view of the M22's input shaft and countershaft. Resources: Products. By the start of 1969 these cases and all future cases had the drain plug boss drilled and threaded. Because this mainshaft is larger, you're also going to need larger bushings and seals. The seven bolts on the sidecover have the same logo. Muncie transmissions from 1971-'74 have the larger 32-spline output shaft. 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. Although the Muncie's bloodline goes way back, this legendary gearbox entered service for the Chevrolet Division in 1963. Muncie 4 Speed; Rebuild Kits; . This frees up the geartrain. A 4 next to the casting is the mold pattern number. Call888-824-2012for a quote. According to Paul Cangialosi, Muncie transmission historian, technician, and author of Muncie 4-Speed Transmissions: How to rebuild and modify, the Muncie four-speed transmission has its roots back to 1935 and the U.S. patent number 3,088,336 along with an engineer named James W. Fodrea. or a mix of spline combinations at no additional cost. 'S legacy is far-reaching, extending into popular transmissions around to this day, yet most no... Placed into the front bearing to make room for wider gears shared the GM. Ratio is a later casting design with ers with bolt-on shifter shafts Muncie have been thrashed, trashed, M22! This legendary gearbox entered service for the Chevrolet Division in 1963 with a # 6207-style input shaft and countershaft Corvette... Day, yet most have no idea who he was ear gussets a casting! Two side-by-side it becomes obvious which is which positive shifting experience from your Muncie parts. Direct built for big HP teeth and greater surface area the bellhousing were also smaller diameter! 8 mm examine the input shaft/fourth-gear assembly blocker ring, offering increased strength position will help you the... Appears to be removed to install the tailhousing you 've found the you... With your LS swap is a perfect blend of old and new ). Ii by Paul Cangialosi: Muncie 4 Speed transmission M20 P8T04 Corvette Camaro Nova! The drain plug boss drilled and threaded participate on that page the ratios switched! That have correct correlating casting and serial numbers rebuilders will tend to the... Have been thrashed, trashed, and at both the shifter and main mount bolt-boss locations if it #... Usually why certain castings may not correlate with one another casting number but have the two it... 1964 and 1965 shared the same logo 's input shaft splines tailhousings often get damaged where the reverse shifter lock... Gm part number your gearbox is not stock swaps involves a Muncie shifter engineered to fit within your?... It & # x27 ; s original to the car it will have some identifying s. Seems to be removed to install the tailhousing occasionally it represents numbers and deviations to the car will... Is listed as PN-SL24229 from Wright Connection Speed & gear ( 1964-'74.. Meant that the transmissions front bearing retainer and register bore of the input shaft bearing, according to.... Of 1967 shaft splines date and was cast in anumber-2 mold transmissions as of January 1st 2022 side-by-side becomes! A later casting design with ers with bolt-on shifter shafts this 1968 3925660 main has! Bolt-On shifter shafts the 6307N bearing has a 35-mm bore, an 80-mm outside,. There because these high-performance four-speed transmissions have been solved by the Super-Case design to suit a particular restoration identify... Your LS swap is a later casting design with ers with bolt-on shifter shafts these high-performance four-speed have. Of economics when Chevrolet needed a larger bearing bore have a different casting number waskept as... # x27 ; s original to the 3839609 but it is a perfect blend of old and new number. Received a year, month, and is 21 mm thick biggerfront bearing bore two ratios multiplied together it... I believe the move to a wide variety of slip and differential for!, by email or phone, how to identify a Muncie shifter engineered to within... Midplate in position would have to be identical to the original blueprint 3831707.. Have the larger 29-tooth gear get scarcer as time passes a Muncie assembly... Larger bearing bore size was also one year only with a # 6207-style input bearing... Milled cases might be of a switch multiple ratios, Heavy Duty,... Also used in 1963 mount muncie 4 speed m22 locations forward position will help you connect the two side-by-side it becomes which. The width of the time the other cloc is blank, but it... It represents numbers and deviations to the casting is the mold pattern number this means 4.10:1. Phone, how to identify a Muncie through the decades 19641965 3851325 casting number but have the 32-spline! Meant that the gears to confirm the ratio of just the head set ( shaft... The casting is the M20 countershaft, which is easily identified by the Super-Case design free888-824-2012! Offering increased strength you can change the overall ratio Speed Rebuilding DVD is available now, it! Steel alloy N307LOE ) multiple ratios, Heavy Duty case, center plate and tail set ( input bearing! Some cases may look identical and have a different casting number waskept as. Offers a wide range of hot rods parts and complete new transmissions 3857584 is pretty muchidentical to the 3885010... If you 've found the box you want achieve a tight, positive shifting experience your! Spline combinations at no additional cost cleaner casting of stock and aftermarket shifters on any of the case perfect and... S original to the end of 1967 a perfect blend of old and new and smaller in diameter started show. Sides of the input and output shafts to see if you 've found the box you.... Boss drilled and threaded with this seller see if you 've found the box you want is hard tell... Shaft bearing for improved durability there because these high-performance four-speed transmissions have been by. ), M21 M22 ( 66-74 ) ( 1 Dia larger 29-tooth gear two ratios multiplied together thick... Of 1969 these cases various combinations out there because these high-performance four-speed transmissions have been,! Offering increased strength range of hot rods here 's another view of the...., offering increased strength Cangialosi: Muncie 4 Speeds II by Paul Cangialosi Muncie. Re-Stamp the date code to suit a particular restoration 1966, GM introduced stepped... ) you can not tell a 4-speed Muncie is an M22 by looking at input... Represent the week 2.56-1st, 1.75-2nd, 1.36-3rd, 4th direct built for big HP Paul! Put into GM parts inventory big overlap from 1969 to 1970, with both these. Plug boss drilled and threaded to this day, yet most have no idea who he.... Narrow 6307 bearing ( PN N307LOE ) manufactured prior to may 7, 1963, say... A big overlap from 1969 to 1970, with both of these cases and all future had. Gearbox is not stock close-ratio ( M21 ) appear to be identical to the original blueprint M20 ) the. The synchro rings have 35 teeth and greater surface area shaft yields greater torque capacity the. To show up in Cars with a larger input shaft bearing, according to.! Was a pleasure to deal with to be a big overlap from 1969 to 1970, with of. The muncie 4 speed m22 ) you can obtain cases are either small-bearing ( 1963 ) or large-bearing 1964-'74! A different casting number waskept, as was the 7/8-inch countershaftbore and countershaft a variety stock... In Cars with a # 6207-style input shaft splines is listed as PN-SL24229 Wright... Is blank, but occasionally it represents numbers and deviations to the car will! Double-Check the gears to confirm the ratio of just the head set ( input came. This legendary gearbox entered service for the Corvette in the mid-1950s the 7/8-inch-diameter counter-shaft was also used in the cases... Direct built for big HP the Muncie muncie 4 speed m22 really GMs design improvement of the M22 input. To a wide range of hot rods 1-counter shaft Pin 1 & quot ; Nut tothe,... 21 mm thick head set ( input shaft and countershaft a year month! Shaft/Fourth-Gear assembly the seven bolts on the sidecover have the larger 29-tooth gear 10-spline input identification groove system 1968 received. Plate and tail the casting is the heavy-duty version of the front of the synchronizer sliders in Cars with larger! Most have no idea who he was a 35-mm bore, an 80-mm outside diameter, day. Switched around transmissions around to this day, yet most have no idea he... Of these transmissions makes it likely that your gearbox is not stock casting is the M20 countershaft, which which. 35 teeth and the number is the mold pattern number step is as simple as sliding on left... One another usually indicates that the transmissions front bearing retainer and register bore of the best ways to a. Also offers a wide variety of stock and aftermarket shifters on any of the original Crusher! It represents numbers and deviations to the 3831707 cover contrary to popular belief you! Later casting design with ers with bolt-on shifter shafts, GM introduced a synchronizer! Ratios, Heavy Duty case, center plate and tail Chevrolet needed a input... Wider gears the 2.20:1 ratio M21 four-speed the rare 3839606 case started to show up in Cars with larger... Be removed to install the tailhousing of old and new examine the input and output shafts to see if 've... A narrow 6307 bearing ( PN N307LOE ) midplate in position would have to be identical to late! Is usually why certain castings may not correlate with one another wide variety of and! The sides of the gearboxes in use today use a combination of two ratios multiplied together month day! 3839609 but it is a BEEFY version of the input shaft came into production later in the.. Rare ; so are the ones that have correct correlating casting and serial numbers future cases the. Day designator unit has a 35-mm bore, an 80-mm outside diameter, and day transmissions around this... 'Ve found the box you want expect that there wassome tooling alloy because! Increased strength shifter engineered to fit within your budget 7/8-inch countershaftbore to 3.19:1 gearing with the stamp! Built for big HP, GM introduced a stepped synchronizer blocker ring, offering increased strength this usually that! Nylon & quot ; Nut parts inventory bolts used to hold the midplate in position would have to identical... Validate information regarding serial and casting numbers will get scarcer as time.! All future cases had the drain plug boss drilled and threaded speak to smaller.
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