Tire size and lift help?

[beau08]

I have just purchased a nearly all intact 1970 C20 Long bed. 400 cid, a/c, pb, ps and all works. I will be starting a renovation project in the near future, but getting my plan together presently. I ran across this image of a '72 Cheyenne that is about exactly how I would like my truck to eventually look like. My question is does anyone have an educated guess from the picture what tires size this is? (315R75 16?) and how high did they lift this truck? Thanks for any input.

[derotoreut]

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"

[beau08]

Thanks for the response. I went back to the source of the photo and you are correct it is a 4x4. I see now why that would be mighty high for 2wd front end. Thanks very much for the spring info as well. Will be collecting data like this to have the build as thought out as I can. I really like the stance of your truck as well.

[Jahloha]

Originally Posted by derotoreut

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.

[derotoreut]

Originally Posted by Jahloha

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.

I never changed out the front shocks. I probably should look into it, but haven't yet at this point. Not even sure if I need to either. Let me know what you end up doing.

[Nitis]

Do you want a wider tire or tall and skinny?

255:85:16 comes to mind

[57taskforce]

If those are in fact 315/75/16s they are ~35/12.5 I run that size on my 98. The Mickey Thompsons I'm running this time around are a little more than 34.5" tall. That being said to clear those on a 67-72 4" springs should give a stance similar to above. I'd start at 4" and throw an add a leaf in if needed. In the future I'm going to run a 17" wheel so I can get away from the metric sizing that is inherent with a 16. That way I can run a 35/12.5/17 and it more or less be a true 35".(each tire brand measures a little different from the another) when I get to that point on my Cheyenne I'm going to run 6" springs and 35/12.5/17 bfg MUDs with m/t classic II's.