What are the differences between GMC and Chevy AD frames?
 

I have a 1953 GMC 1/2 ton long bed with a slightly twisted frame. I've read on Stovebolt and OldGMCTrucks and I know that there are differences between GMC and Chevy frames - specifically in the radiator support area to compensate for the longer/larger GMC motor. What other differences are there?

I'm not planning on keeping the original drive train, instead I'm going with a sbc/th400/MII set up.

I also have a line on a super cheap Chevy shortbed 1/2 ton frame that I wouldn't mind picking up - if it will work.

thoughts??

Re: What are the differences between GMC and Chevy AD frames?
 

i think that is the only difference. just grind the rivets off of your rad support and the chevy on and swap them. i almost positive that will work.

Re: What are the differences between GMC and Chevy AD frames?
 

The rear of the frames between the 3/4 ton Chevy and the 1/2 ton GMC are different as well. The 3/4 ton Chevy frame rails are straight back wheras the 1/2 ton GMC frame rails bend outward towards the bed sides after the cab. This makes the bed mounting situation somewhat complicated especially for the rear cross member.

Re: What are the differences between GMC and Chevy AD frames?
 

Both series changed frames in '54 to lower, flatter kicks in order to get a 2" deeper box.

Re: What are the differences between GMC and Chevy AD frames?
 

so then are 1/2 ton Chevy frames are the same as 1/2 ton GMC frames???

Re: What are the differences between GMC and Chevy AD frames?
 

In the 1/2 ton frames, the difference between GMC and Chevy is the front frame cross-member.