Rear coil question
 

I have a 68 gmc 910 lowered two inches in rear with lowering blocks. My question is will a c20 rear coils fit. Mine are worn out and the truck does carry a load from time to time. There's a guy selling some in town here as HD coils for the 67-72,when I check part moog6101-3 number they are for c20. I'm just wondering if there will be fitment issues or a higher free spring height vs c10 coil. I can't find a length spec for either spring. Thanks for any info

Re: Rear coil question
 

I would imagine that the C20 springs are taller thicker bigger in general than the C-10. Other than saying they are bigger I can't say for sure if you can put 20 springs in place of 10's. Jim

Re: Rear coil question
 

Call up Eaton Detroit spring. They will be able to tell you what will fit and the specs on the HD spring
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Re: Rear coil question
 

If you have a good parts store and on decent terms with the counter help Moog still makes catalogs for there parts. They can look up the springs by part # and it will list spring rate, free height, installed height and coil diameter, and load rating of the spring. You can probably find that information on the Internet now.

Re: Rear coil question
 

Yes I found a spec page with the info I needed. Thx all

Re: Rear coil question
 

They are the same. I installed a set of C20 springs with no issues.