3/4 ton frame vs 1/2 frame

[Sick5]

I got a frame to swap going to shorten it and paint it. pretty much just transfer all the porterbuilt stuff to this quarter ton frame. is there any difference between the two.? are they pretty much the same? half ton vs quarter ton?

[Sick5]

also notice that the rear cab mount are different.

[LT1 Burb]

Yeah, same frame, the 3/4 tons used a different rear cab mount. You will want to replace those with the 1/2 ton ones.

[Sick5]

Ok thanks LT1 burb. Just wanted to make sure

[padresag]

Originally Posted by Sick5

Ok thanks LT1 burb. Just wanted to make sure

they are close but that only counts in horseshoes and hand grenades'
http://67-72chevytrucks.com/vboard/s...d.php?t=550856
ron

[Sick5]

How.much of a diffrence would that make when putting stuff back together

[padresag]

what is wrong with the original frame?
ron

[Sick5]

Waive and has a Crack in it.

[padresag]

Originally Posted by Sick5

Waive and has a Crack in it.

I don't know what a waive is and where is the crack. cracks can be repaired . your going to cut and shorten the other so that involves welding. it is just that you change your frame registration when you change your frames and that changes legalities with your vehicle.
ron

[Sick5]

The bottom of the frames waives in and out or up and down from maybe lifting it with the jack.
Now the Crack is on the bottom of the C. Or as the frame bends up its cracked there. I had a few incidents. Blown lines on my air Suspension and slammed hard on the freeway.

[padresag]

Originally Posted by Sick5

How.much of a diffrence would that make when putting stuff back together

I really don't know it it makes any difference. there is an 1/8" overall difference in width. would the crossmembers be 1/8" narrower or the frame 1/8" wider or does it matter. I would take any measure from the top down .
ron

[LostMy65]

What about the 60-62 x-frame....
Is there any difference between the 1/2 ton vs 3/4 ton?

[1enick72]

Don’t mean to highjack but since this is a similar question. I’m using a 65 C10 frame and the cab came from a 3/4 or 1 ton. It sounds like I’ll have to relocate the rear body mounts but any other issues I’m going to run into? Frame just got finished at the blast shop, hoping to pickup tomorrow.

[Captainfab]

Not that I am aware of, but then again I am not real familiar with the '60-'62 frames.

Originally Posted by LostMy65

What about the 60-62 x-frame....
Is there any difference between the 1/2 ton vs 3/4 ton?

The '63-'66 C10,20 and 30 cabs are all the same and interchangeable. The rear cab mount location is the same. It is the rear cab mount on the frame that is different than on a C10.

Originally Posted by 1enick72

Don’t mean to highjack but since this is a similar question. I’m using a 65 C10 frame and the cab came from a 3/4 or 1 ton. It sounds like I’ll have to relocate the rear body mounts but any other issues I’m going to run into? Frame just got finished at the blast shop, hoping to pickup tomorrow.

[1enick72]

The '63-'66 C10,20 and 30 cabs are all the same and interchangeable. The rear cab mount location is the same. It is the rear cab mount on the frame that is different than on a C10.[/QUOTE]

So I should be able to cut off my mount on the frame and weld it into the position needed?

[LostMy65]

Originally Posted by 1enick72

So I should be able to cut off my mount on the frame and weld it into the position needed?

If you have a 63-66 C10 frame, you shouldn't have to cut and weld anything.
It's the 63-66 C20 frames that have a different rear cab mount.
I'll see if I can find the thread, but the 63-66 C20 frame has an interesting vulcanized rubber mount that was probably used to help with the stiffer ride of the C20.

[LostMy65]

Here are the C20 rear cab mounts that would have originally been riveted to the C20 frame.
https://www.steelerubber.com/cab-mou...ice-70-2212-48

I'm still searching more more that I'll post.

[LostMy65]

I think this may help
http://www.persh.org/pickup/c20_cab_mounts.htm

[1enick72]

Originally Posted by LostMy65

I think this may help
http://www.persh.org/pickup/c20_cab_mounts.htm

That one helps, thank you. I understand now, I was missing how the mount was different but but the cab.

[LostMy65]

Since that persh article was written .....
https://www.steelerubber.com/cab-mou...ice-70-2212-48
and
https://www.classicparts.com/mobile/...ctinfo/35-129/