C3 4 SPEED INFO.
Thread Starter
Instructor
Joined: Jul 2000
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From: PANAMA OKLAHOMA U.S.
C3 4 SPEED INFO.
What years in the C3 years did the M 21 4 speeds come out I no the base MM4 M20 for L 48 and the MM4 M20 for L82 were there some m21 that came out in the L82 in all C3 years
Race Director
Joined: Apr 1999
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From: NM
Re: C3 4 SPEED INFO. (GERALD)
M21 was the Chevy RPO code (regular production option) for the close ratio 4-speed. For the C3, it was an option code was used from 68 through 78. In 79 the RPO changed to MM4 and continued through '81. 82 was an automatic only year.
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