Muncie 4-Speed Transmission Year?/M22?
#1
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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?
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?
Last edited by Chadborne; 10-18-2008 at 05:00 PM. Reason: Forgot to include that the number P7B01 is stamped in the transmission.
#2
Melting Slicks
This link will address most of your questions,
http://www.5speeds.com/video.html
3884685 side cover
3846429 tail housing
http://www.5speeds.com/video.html
3884685 side cover
3846429 tail housing
Last edited by dannyman; 10-18-2008 at 06:01 PM.
#3
Drifting
Member Since: Oct 2007
Location: Brown Summit North Carolina
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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?
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
#4
Account disabled by user request 5 Jan 09
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
Last edited by FrankVincent; 10-18-2008 at 10:19 PM.
#5
Muncie M20
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?
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?