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northerngmc · 07-21-2018, 05:20 PM

By "heavy duty" do you mean C20 3/4 ton coils or does your truck have a "Heavy Duty" option?

My 68 C20 has rear coils, but it also had a helper leaf spring for when the coil went lower than a certain point.

I replaced my C20 coils with C10 4" lowering coils. 1/2 ton coils fit nicely.

Here is the difference between factory 3/4 ton coil and the 4" lower 1/2 ton coil I put in!

07-21-2018, 05:20 PM	#2
northerngmc Registered User Join Date: Jan 2004 Location: Whitehorse YK Canada Posts: 2,651	Re: C20 coil springs By "heavy duty" do you mean C20 3/4 ton coils or does your truck have a "Heavy Duty" option? My 68 C20 has rear coils, but it also had a helper leaf spring for when the coil went lower than a certain point. I replaced my C20 coils with C10 4" lowering coils. 1/2 ton coils fit nicely. Here is the difference between factory 3/4 ton coil and the 4" lower 1/2 ton coil I put in! __________________ Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is!