'67 to '72 cab on '73-'87 frame questions

[stevek20]

Has anyone done this before? I have a 1975 K20, would like to shorten and put an earlier '67-'72 style body on it. I was wondering if anyone knows if the cab mounts will line up or at least be fairly easy to modify to work. Just to explain, I am confident enough to cut, weld, fabricate etc. if necessary but was curious just how close they were to lining up. I know, if its too much work I'd be better off getting the earlier frame and everything, its just that I already have a good donor '75 k-20. Any help would be much appreciated. Also- tried searching but does anyone know if the 1/2 ton frames are the same metal thickness as 3/4 ton frames, or are the 3/4 ton frames heavier steel? thanks

[ChaseDale3and8]

Send a PM to a member here called Mudder. He has done it, has the pics, and a great description on how to do it. I do know that the 73-87 wheelbase is longer than the 67-72, so it would have to be cut down some. ...Joe

[71blksuper4x4]

I have done this before, but it would be easier to cut the rivets on the 2wd frame on the cab and bed supports to bolt to the newer frame. If that isn't help, like above, try Mudder, he has a good explanation on the conversion. Trevor