Muncie 4-Speed Transmission Year?/M22?
The transmission that came with my 1970 454 has several numbers on it, but I can not find M20, M21 or M22 on it. Where is it located?
Also, the number above the GM U.S. patent number is 3885010 which I understand is the casting number for 1965-1967. Is this true? The person that sold me the car was not the original owner, but he thought it was all original. Other numbers that are stamped in the transmission are 3884685 and 3846429. Any idea what these are? |
This link will address most of your questions,
http://www.5speeds.com/video.html :cheers: 3884685 side cover 3846429 tail housing |
Originally Posted by Chadborne
(Post 1567516824)
The transmission that came with my 1970 454 has several numbers on it, but I can not find M20, M21 or M22 on it. Where is it located?
Also, the number above the GM U.S. patent number is 3885010 which I understand is the casting number for 1965-1967. Is this true? The person that sold me the car was not the original owner, but he thought it was all original. Other numbers that are stamped in the transmission are 3884685 and 3846429. Any idea what these are? A= M20 B=M21 C=M22 David |
Originally Posted by Chadborne
(Post 1567516824)
Also, the number above the GM U.S. patent number is 3885010 which I understand is the casting number for 1965-1967. Is this true?
Other numbers that are stamped in the transmission are 3884685 and 3846429. Any idea what these are? 3884685 = Sidecover number for 1966-67-68 ... M20, M21 or M22. 3846429 = Tailhousing number for 1964-65(until Feb '65) ... M20, M21 or 1965 ... M22. There is a build date on the passenger side of the rear maincase, reading in a vertical position. That will help determine a specific manufacturing date. There will be no A,B or C suffix code, as that started with the 1969 model year. Otherwise, it sounds like you have a transmission using various parts, and the only way to tell what you actually have is to open the sidecase and count teeth. - - - - - - - - - - - - - P7B01 = Build date = 4 speed Muncie, 1967, February 1st |
Muncie M20
Originally Posted by Chadborne
(Post 1567516824)
The transmission that came with my 1970 454 has several numbers on it, but I can not find M20, M21 or M22 on it. Where is it located?
Also, the number above the GM U.S. patent number is 3885010 which I understand is the casting number for 1965-1967. Is this true? The person that sold me the car was not the original owner, but he thought it was all original. Other numbers that are stamped in the transmission are 3884685 and 3846429. Any idea what these are? |
Originally Posted by GFehlman
(Post 1595969953)
I have a M20 out of my 68 Vette, I know the main case numbers and the tail piece, but what does the 3915088 that is on a tab bolted to the side cover stand for?
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