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Old 08-14-2017, 07:31 PM   #1
allytle
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Join Date: May 2006
Location: lake havasu city, az
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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?

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Old 08-14-2017, 11:49 PM   #2
Captainfab
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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.
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Old 08-15-2017, 12:24 AM   #3
allytle
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Re: C30 onto C20 suspension swap.

Quote:
Originally Posted by Captainfab View Post
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.
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Old 08-15-2017, 01:06 AM   #4
allytle
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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
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Old 08-15-2017, 11:55 PM   #5
Captainfab
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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.
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Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE
Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE
Hydroboost Mounting Plates HERE
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Old 08-16-2017, 12:07 AM   #6
rvrfoot
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Re: C30 onto C20 suspension swap.

I did one from a c20 to a c10 on a 69.
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Old 08-16-2017, 12:52 AM   #7
allytle
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Re: C30 onto C20 suspension swap.

Quote:
Originally Posted by Captainfab View Post
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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