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Originally Posted by toomanybirds
Dick,
The M-22 close ratio Muncie was only used in Pontiacs in 71 and 72. I know all the 455 HO cars got the M-22, not sure if the non-HO 455's did also.
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Just to chime in concerning M22 usage.
Can't claim 100% knowledge concerning '71 models, but I have the '72 dealer order book and have studied the powertrain charts.
In 1972, and fairly certain this also applies to the 1971's as well, the M22 transmission was the only 4-speed available with the 455HO, and it was optional on the 400 4V engine.
As an example, I have a friend here in town who owns a completely original '71 Formula 400, M22 with a 3.73 posi - all factory. It's obviously a non-A/C car to have come with the 3.73 rear.
The lone transmission available on the 1971 D-port 455's was the M40 auto. Of course, the D-port 455 was unavailable on 1972 Formulas anyway.