29069 Calahan Rd, Roseville, MI 48066
Info: 586-772-0000 | Orders: 800-828-7229

1972 Chevelle, Corvette Camaro Firebird Muncie M22 4 Speed Transmission 03/15/72

This is a Very Rare and Completely Original M-22 Transmission with REAL GM Rock Crusher Gears for a 1970 70 1971 71 and 1972 72 GM Vehicles including, Chevy, Corvette, Camaro Z28, Pontiac Firebird and Chevelle M22, (M-22), Muncie Close Ratio Rock Crusher 4 Speed Transmission. 1972 VIN includes (?C12 50429 37660?).

Very Rare Part Tag code still on transmission (6271517WJ) cross references to 1971 and or 1972 Camaro and Firebird.

These first came out in the 1970 Chevelle with the fine spline input and they were then released in the 1971 and 1972 Corvettes and other GM Cars.

This has the fine spline input with no lines or grooves, the special GM original factory gears, (no aftermarket or imported gears), and the fine spline large output shaft. The 1970 Chevelle and 1971 and newer other cars use this fine 26 spline input. This transmission comes with a drain plug from the factory, like all M-22 transmissions.

The gears are straighter cut than the normal Muncie 4 speeds, so they make more whining noises and that is why the are called "Rock Crusher" transmissions. This is the only one we have left after owning many of them over the years. We used to use them in our SCCA and IMSA Road Racing Corvettes back in the mid to late 70's. We actually qualified in the fifth starting position in one of our old beater wide body Corvettes at the 1977 Sebring 12 Hour Race in Florida, which is still hard to believe to this day! I actually rebuilt the stock leaking Corvette brakes and the Rock Crusher Transmission between qualifying and the start of the race, believe it or not! We couldn't afford the Wilwood Brakes that our competitors had on their cars. But enough about that, this is the 2.20 first gear setup like all real M-22 transmissions. None of them were built as wide ratio transmissions. This deserves to be in a very special car!

Main Case: 3925661 Stamped P2C15C, March 15, 1972 Rock Crusher

Side Cover: 3952648 with Bolt-on Type Shift Shafts and 3-4th gear TCS switch which has been capped off.

Tailhousing: 3978764 with Right Hand, (Passenger Side), Speedo Gear Set

Original GM M-22 Rock Crusher Gear Set with No Rings on Input "Keep Your GM Car All GM!"

Vehicle Applications:
1972 Chev/Pont/Olds/Buick 4 Speed  
1971 Chev/Pont/Olds/Buick 4 Speed  
1970 Chev/Pont/Olds/Buick 4 Speed  
1972 Chev/Pont/Olds/Buick Car   

Item #:12063
Corvette Series:Not Corvette
C3 1968-1982
Part Brand:GM, General Motors
Manufacturer:General Motors
GM Group Number:4.000
Manufacturer Part #:Various
Casting Number:3925661
Casting Date:1970
Interchange Part #:3925661
Placement Details:M-22 Transmission Behind the engine assembly
Surface Finish:Aluminum
Manufactured In:United States
Qty Available:1
Retail Price:$2,699.00
Shipping Price:$116.00 (Continental US)

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