I've got a 1969 Olds 442 and I need to put a different frame under it. I thought I had a good frame from a 1971 Cutlass, but discovered today that it is no good as well (rusted bad behind the front body mounts). I did pull the disc brake set up from it though. But what I need to know is what frames will fit. I think it is all GM (Chevelle, GTO, Skylark, Cutlass, 442) from 1968-1972, is that correct? Do any other models like Grand Prix or Monte Carlo fit? Also will a frame from a 4 door work?

 

Believe the GP + MC have the same WB, but are extended in the front.
4-dr is a longer WB, as is a wagon.

 

The 69-72 GP and 70-72 Monte have a longer wheelbase than other A-body 2drs and the frames are different.

2dr Holiday and Sport coupes use 112" WB
Convertibles use 112" WB boxed frame
GP and Monte use 115" (?) wheelbase
4dr and flattop wagons use 116" WB
Vista and Buford SportWagon use 121" WB boxed frame

 

Thanks for the info guys!