Besides the M-20, was any other 4-speed transmission installed in the 1972 Oldsmobiles? Was an M-21 available in a '72 W-30? Also, was the Muncie used for both the 455 and 350, or was a Saginaw used for the 350 engines? Any help with these questions would be most appreciated.

 

The M20 was the only 4-spd offered in the Cutlass/442 for 1972.It had the fine-spline input,and large output shafts.Same for 350 & 455.There was a manual 3-spd offered as well.