GMC 3/4 cab mounts the same as 1/2 Chevy?
 

Hey all,

Looking to purchase some new cab mounts for my 66 GMC 3/4 Ton. Looks at mounts readily available online, they appear to be for the 63-66 Chevy 1/2 ton, and 3/4 ton have different frame mounts thus they take different mounting hardware. However, from looking at photos my rear cab mounts appear to be the same as the 1/2 style, which made me wonder if the GMCs used the 1/2 mounts across their range.

http://i1037.photobucket.com/albums/...psiup6vcjf.jpg

In that photo you can see what my rear mounts look like. Would I be good to go with the standard 1/2 mount kit?

Cheers all!

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

hard to say for sure but the one 64 gmc 3/4 ton I have has the chevy 1/2 ton style mounts , not the vulcanized mounts like a 3/4 ton chev....

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

Wow... this is news to me. Can anyone else confirm non-rubber rear mounts on their GMC 3/4 tons? Sure they haven't been modified over the years? That's pretty strange, if you ask me.

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

Are they riveted on or bolted?

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

I just recall the mounting brackets for te 3/4 ton looking differently in diagrams. The rears in the photo above look like 1/2 ton to me. They're riveted on, but cant be 100% it's factory. Looks factory though.

Are you saying the mounts in the photo shouldn't have come on a 3/4 ton?

I can't remember what the actual mounting material looked like unfortunately.

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

I have a GMC 1/2 ton and a GMC both 66s sitting side by side and they have the exact same mounts for the frame and cushions, same height and shape.

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

I had a 66 Chevy 3/4 ton and the rear mounts were different than the 1/2 ton, kinda weird looking setup.

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

PS, I want to warn you about that fuel line you are running. I ran Russell steel braided fuel line for my LT1 and I had to take it all off after 3-4 years and throw it away. The fuel actually weeped through the lines over time and soaked the frame the whole length. I had to move the truck outside because the garage and house stunk of gas. I redid it in aluminum and had no more problem. I don't know if it was a bad run of line or if the fuel nowadays eats the rubber.

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

thats strange the rear mounts would be different between 3/4 ton gmcs and chevys,my 3/4 ton has sheer type with vulcanized rubber.. anyone know why,was it a comfort thing more cushioning?

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

that does look like the right rear mount for the 1/2t insulators
ron

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

Thanks for the heads up. I'll definitely keep an eye on it. They should be ethanol safe by now but I'll send a note to summit and see.

So it sounds like I should be good with 1/2 ton mounts. Thanks all!

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

RickyWideGlide, I think the comfort issue was the entire thing. The rear mounts on the 3/4 ton Chevy's do absorb more vibration and such, but I have never seen that it was enough to make a whole lot of difference. They are just plain rough trucks anyway :lol:

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

I can confirm the 1/2 chevy mounts are the ones used on my 64 gmc 3/4 ton.

Sean

Re: GMC 3/4 cab mounts the same as 1/2 Chevy?
 

My 63 GMC 3/4 ton had the same rear cab mounts as the Chevy 3/4 ton mounts. They were pretty jacked so I replaced with 1/2 ton mounts.

Before...
http://i9.photobucket.com/albums/a91...p/DSC05305.jpg
http://i9.photobucket.com/albums/a91...p/DSC05306.jpg

After...
http://i9.photobucket.com/albums/a91...p/DSC05307.jpg