QR Code Link to This Post. for those who like to play/ have fresh m-22 muncie rock crusher for you/ newly put together/ used 661 case(gm strongest) with brand new gears from transparts warehouse reading calif. ... for those who like to play/ have fresh m-22 muncie rock crusher for you/ newly put together/ used 661 case(gm strongest) …

It was time to give the Muncie four-speed a rebuild. The Muncie four-speed is as legendary as the cars that it was put into, with the M20, M21, and Rock Crusher M22 models all part of the hot rod ...

Step 1. Check the casting number, the production year and the gear ratios on the aluminum serial number plate attached to the transmission box. Every GM Rock Crusher has a …

Although some claim that the M23 is a 'rock crusher', it is indicated that this box was assembled in both wide and close ratio components and also with straight cut gears common to the rock …

Nevertheless, the original purchaser of this machine opted for the traditional four-speed—another GM pinnacle, the Muncie M22 rock crusher. The M22, a close-ratio box, was so called because of the reduced angle on which its gears were cut, which were stronger but considerably noisier than those in the wide-ratio M20 and close-ratio M21.

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The M-22 gear teeth are cut at a noticeably lower angle (not quite at a straight angle as some people say). This lower angle of the teeth imparts greater strength to the gears, but it also increases the noise caused by the meshing of the gears. This higher level of noise is where the nickname "Rock crusher" originated.

The 1965 M22 maintained the 10-spline input and 27-spline output as all other Muncie transmissions from that model year.The 1965 M22 also had the drain plug boss drilled and tapped for a magnetic drain plug. This was not done on the M20 or M21 transmissions. Driver's side of restored 1965 M22 transmission.

1969-1974 codes include a suffix letter at the end to aid in identification of transmission ratios. A = 2.52 1st gear wide ratio M20, B=2.20 1st gear close ratio M21, C = 2.20 first gear Rock Crusher M22. One example code would be ( P0E21 A ) which reads: Muncie four speed aluminum for passenger car, 1970, May, 21st, ratio M20.

Feel free to upload pictures and ask questions. Some of the best Muncie builders participate on that page. Muncie RPO Codes . Just three types of Muncie 4-speeds are available based on the RPO (regular production …

Muncie 4-speed Transmission (Group 4.000) -. Casting Numbers. (1) All M22 applications except 454 engine. (2) All 454 Chevelle applications. The M22 was produced in 1973 and 1974 for other GM divisions. All wide ratio transmissions are designated M20 and close ratio transmissions are designated M21 or M22 depending on the gear set.

It is easy to determine an early Muncie four-speed transmission side cover from the later models by the way the transmission shifter arms are attached. The 1964 through 1968 Muncie side covers had ...

I believe the pass side. Will start with a "P" For example P0C13C Starting in 69, the date code also has the ratio designator letter on the end. A = M-20, B = M-21, C = M-22 There should also be a partial VIN in the same general area. If it's the original trans, should match the VIN of your car. P = Muncie Pass Car 0 = 1970 C = March 13 = day ...

Michael Coons on NEW Auto Gear Upgraded Ultra Case Muncie HD M22 4-Speed Rock-Crusher Street/Strip. Camaro, Corvette, Chevelle, Nova. BLACK FRIDAY WEEK SALE!!! FREE SHIPPING!! 11/20 to 12/1 (To Lower 48 States) Brett Henson on Auto Gear Upgraded Ultra Case M22Z Rock Crusher 4-speed. Perfect Performance with 2.73 to 3.42 Rear …

People think all Muncie four-speeds are Rock Crushers, but they're not. Nowadays there are custom gear ratios and set ups, including M21 wide-ratio and M22 wide-ratio units. You can pretty much get what you want. …

This code list listed the model code, RPO (regular production option), specific transmission type, gear ratio, transmission part number, and transmission letter code designation. At the bottom of the …

Description. This a BRAND NEW SUPERCASE M22 Muncie Rockcrusher Style Transmission. This is a BEEFY version of the original Rock Crusher transmission. Most all the weak points of an original Muncie have been solved by the Super-Case design. The Supercase has extra casting in all the known weak areas. The mid plate is aircraft grade …

RPO M20 is wide-ratio 4spd; M21 is close-ratio 4spd; M22 was a specialty Heavy Duty close-ratio 4spd (I personally do not know if RPO M22 was used to designate anything other than the Muncie 2.199 1st gear heavy duty box) an '80 camaro would have had a T10 or saginaw. NastyZ28 has a great forum on decoding RPO codes. Nate

Several things are needed to identify a Muncie four-speed transmission correctly. One of the best ways to identify a Muncie is the casting numbers on the external components of the transmission ...

M-37 "Super Muncie" or "rock crusher" Several ratios available, large input shaft (1 1/4, like "Hemi" 4-speed and "big" Top Loader), spur-cut 1st gear (increased load "shock" capability, makes a horrid "whine", thus the nickname) and large output shaft. The only cars I recall them in were the ZL-1s. LOTS sold over the counter for racing in the ...

GTO 3-Speed Transmission, 1972 GTO, Heavy Duty 3-speed transmission, Dearborn, Muncie, M13, M12, Muncie M20, M22 rock crusher, Auto Round-Up MagazineA: L.C., thanks for the nice words. ... is called either a Dearborn (1965-1969) or a Muncie (1970-1973) M13 unit, and utilizes the code M13 on the sheets. ... notably the …

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). (The M does not stand for "Muncie.")

The first time I heard the term "rock crusher" was in reference to the transmission in the 1967 L88 Corvette. Due to the low gear angle there is a fair amount of gear noise, really like a medium / heavy duty truck transmission. True enough the M22 did trickle out the door in 1965-67 and was buried in the option lists.

I am building a decent horsepower Poncho 400. I am researching transmissions and located a couple that I would like. Found the old Muncie "Rock Crusher", and read up about it. Found a Mopar A833, and read up on it. I want to keep a 4-speed so that puts out the T56 plus I heard that Tremec will melt with that much torque...

The M20 and M21 have the same cut to the gears, the M22 is a straighter cut resulting in a greater strength. Since the M20 and M21 look the same one way to tell them apart (aside from the grooves on the input shaft) is the tooth count on the cluster gear. There are 7 different input shaft possibilities on a Muncie.

Muncie Rock Crusher Code Numder. Página inicial-Muncie Rock Crusher Code Numder; ... Muncie M22 "Rock Crusher 4 Speeds were made From 1965 TO 1974: The most popular transmission of it's time for high performance cars built for Chevrolet and all performance oriented G.M cars. They have the same gear ratios as the legendary M21 …

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 had the same gear ratios as the M21 but with a heavy …

The ST10 duplicated the current spline configuration, length, and shifter bolt patterns. The glory days of the 4-speed Muncie were over and BorgWarner once again was back in the saddle. The ST10's production in GM vehicles was from 1974 to 1988. Because of production quality issues, no Corvettes were produced in 1983.

#1 · May 9, 2005. I recently purchased a 70 Chevelle LS5 with an M22. I have the build sheet but there is no S/N for the Transmission. I have researched several …

Get the best deals for muncie 3925660 at eBay. We have a great online selection at the lowest prices with Fast & Free shipping on many items! ... 68-69 C3 Corvette M22 Muncie 4Speed "ROCK CRUSHER" Trans-10 Spline Italian Gears. Opens in a new window or tab. Remanufactured. $2,995.00. ... JAN 69 CHEVY M22 C CODE MUNCIE 4 SPEED …