Bill is correct about the frame rails being wider at the rear on 3100's vs 3600 and bigger trucks. 48 inches at the rear, tapering to that width pretty uniformly from the front to about 2 feet forward of the rear. The 3600 frames are 36" wide from about the middle running board bracket to the rear of the frame.

But I think that shock mounts could be moved just inboard of the frame on a 3100, as long as the frame taper is dealt with. It could be equivalent of mounting the shocks just outboard of the frame on a 3600.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.