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Old 11-13-2014, 02:24 PM   #4
Jahloha
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Join Date: Oct 2013
Location: Mililani, HI
Posts: 526
Re: Tire size and lift help?

Quote:
Originally Posted by derotoreut View Post
That's a pretty hefty lift for a 2WD. I'm wondering if there's a body lift involved. Can't seem to tell from that angle. When I did a front disc conversion. I installed some HD springs (P/N 2772074) bought from NAPA. Tires do not rub at all. They are 285/70-17 tires with H2 Hummer wheels. The ride is a bit stiff, but hey it's a 3/4 ton truck. Here's a comparison of the springs:

The stock HD C20 springs are as follows:

http://www.napaonline.com/Catalog/Ca...752_0162319756

Part No.: 2771752
No. of Coils: 7.92
Free Height: 12.94"
Spring ID: 3.68"
Spring Load Height: 10"
Design Load: 2950
Spring Rate: 1016
Wire Diameter: 0.812"

The springs I put on from C10, C20, C30 from 1973-83. They are as follows:

http://www.napaonline.com/Catalog/Ca...074_0162301536

Part No.: 2772074
No. of Coils: 8
Free Height: 13.61"
Spring ID: 3.676"
Spring Load Height: 10"
Design Load: 3841
Spring Rate: 1060
Wire Diameter: 0.83"

You could also use C30 mid '80's 1-ton springs, but I thought they would be too stiff. Those are:

http://www.napaonline.com/Catalog/Ca...085_0162304063

Part No.: 2773085
No. of Coils: 7.93
Free Height: 13.34"
Spring ID: 3.65"
Spring Load Height: 11"
Design Load: 3289
Spring Rate: 1318
Wire Diameter: 0.906"
Which shocks did you end up running in the front? Trying to decipher which shocks Ill need to adjust for the 2" increase in ride. Or if I even have to worry about that.
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My grandpa, Gramps, won a 1970 C20 in 1969 for $1. I'm on a mission to restore it before he passes.

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