The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1/2 ton

Shyguy · 07-11-2010, 12:53 PM

The frames are the same, but one minor difference that might throw you is that the back cab mount rubber is thicker on the 3/4 ton frame. So make sure you use the proper mount rubber bushings or you will have a fitment problem (gap) between the fenders and cab.

When you have the two frames side by side you will notice that rear cab mount on the 3/4 ton is mounted lower on the frame. That was done so a thicker rubber bushing could be used to make for a smother ride with the stiffer suspension.

07-11-2010, 12:53 PM	#4
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: 1/2 ton - 3/4 ton swap (need advice) The frames are the same, but one minor difference that might throw you is that the back cab mount rubber is thicker on the 3/4 ton frame. So make sure you use the proper mount rubber bushings or you will have a fitment problem (gap) between the fenders and cab. When you have the two frames side by side you will notice that rear cab mount on the 3/4 ton is mounted lower on the frame. That was done so a thicker rubber bushing could be used to make for a smother ride with the stiffer suspension. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.