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Originally Posted by smbrouss70
I had a 68 2wd GMC with leaf rear for a parts truck, and I can't be 100% sure but I want to say that the frame rails were indeed straight. Maybe JJ can look under his truck and maybe take a pic to let us know for sure.
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First, I'll admit I haven't actually swapped the parts yet, but . . ...... I
have a leaf frame in my driveway & they have the same 'kick-outs' over the rear end housing because the frames are the same. I purchased this 'leaf' frame to replace my current 'coil' frame on my RestRod. All I'll be doing is swapping my coil related bracketry over to the leaf frame. I took measurements before buying the frame to make sure they were indeed similar.
Coil equipped trucks have a different crossmember where the coils mount specifically for locating the upper end of the coil & shocks, + reinforce the frame in that area. They also have a bracket for the panhard bar. Leaf frames have a crossmember & are reinforced @ the frame where the front hangers mount as well as having different style shock mounts.
Think about it. Even though it was a long time ago, it wouldn't have been very cost effective to use different frames when building the 2 different suspension types.
I would take some pics but the frame currently has a swb steel floor sitting on it. I don't think pics from the bottom side would show the similarities.