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-   -   C30 onto C20 suspension swap. (http://67-72chevytrucks.com/vboard/showthread.php?t=744570)

allytle 08-14-2017 07:31 PM

C30 onto C20 suspension swap.
 
I'm about to jump on this 72 C30 chassis I found. I want to swap out the suspension front and back and put it on my 63 C20. Is it as straightforward as I think?

https://s19.postimg.org/ba5nxy7lv/IMG_5320.png

Captainfab 08-14-2017 11:49 PM

Re: C30 onto C20 suspension swap.
 
The front will be just like swapping the suspension on a C10.....2 holes to drill and 2 holes to elongate. As for the rear, are you wanting to change to leaf springs or keep the trailing arms? If that rear differential is a Dana 70 as I mentioned in your other thread, it will not bolt up to the trailing arms. A '73+ 14 bolt will bolt up just barely. Some guys grind a little groove in the axle tubes to facilitate u-bolt installation.

allytle 08-15-2017 12:24 AM

Re: C30 onto C20 suspension swap.
 
Quote:

Originally Posted by Captainfab (Post 8016720)
The front will be just like swapping the suspension on a C10.....2 holes to drill and 2 holes to elongate. As for the rear, are you wanting to change to leaf springs or keep the trailing arms? If that rear differential is a Dana 70 as I mentioned in your other thread, it will not bolt up to the trailing arms. A '73+ 14 bolt will bolt up just barely. Some guys grind a little groove in the axle tubes to facilitate u-bolt installation.

I was hoping to keep the trailing arms. I don't know what the rear end is. I assumed it would work since it was a Chevy. It's still worth getting even if I don't use the rear end. I'll find out tomorrow.

allytle 08-15-2017 01:06 AM

Re: C30 onto C20 suspension swap.
 
If this is correct it's an HO72 and compatable with my 63. I'll keep my fingers crossed. lol
https://s19.postimg.org/4outr8003/IMG_5327.png

Captainfab 08-15-2017 11:55 PM

Re: C30 onto C20 suspension swap.
 
If it is a Eaton HO72, I would not bother with it. There is basically no aftermarket support for those and the highest gear ratio available in used form is 4.10's.

A Dana 60 or a 14 bolt is a far better choice.

rvrfoot 08-16-2017 12:07 AM

Re: C30 onto C20 suspension swap.
 
I did one from a c20 to a c10 on a 69.

allytle 08-16-2017 12:52 AM

Re: C30 onto C20 suspension swap.
 
Quote:

Originally Posted by Captainfab (Post 8017549)
If it is a Eaton HO72, I would not bother with it. There is basically no aftermarket support for those and the highest gear ratio available in used form is 4.10's.

A Dana 60 or a 14 bolt is a far better choice.

I got it home today. It's pretty trippy. It used to be a motorhome. He's using the cab for another build, it's emaculant. The thing only had 62,000 miles on it and it was parked under a cover when it wasn't being used. Since it was a motorhome it's got the 157" wheel base and the narrow dually rear end. I'm tempted to put my cab in it instead. With that low mileage I'd probably run it for a while and then start changing stuff like the rear end out here and there.


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