1986 Chevy C10 SWB Step Side

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Doing research on front suspension rebuild, following info from Moog-Problem Solver Coil Spring Catalog June 2009,:

They list three springs for 1973 to 1987 trucks, etc;

Number "6252" - C10, c1500,r10 for 91 to 73, also for c20 and c30 for [81-77]{ NOTE: these are generalizations of applications- their was a page of specific applications, so need to check book for specific models/options}

Number "6254" as Heavy Duty - same as above models and years except C30 is for 91 to73 for this spring.

Number 6560 for C30 -F42 and 6560S as super duty, and F42 for years 1982 to 1987 (It is also used for later year trucks too)

Coil Spring Specifications:

6252- inside dia =3.680 in., bar dia =.781 in., installed height = 10.00 in., load = 3156 Lbs., spring rate = 843 lbs/in, free height = 13.64 in.

6254- inside dia =3.676 in., bar dia =.828 in., installed height = 10.00 in., load = 3841 Lbs., spring rate = 1060 lbs/in, free height = 13.61 in.

6560- inside dia =3.650in., bar dia =.906 in., installed height = 11.00 in., load = 3289 Lbs., spring rate = 1501 lbs/in, free height = 13.19 in.

6560S- inside dia =3.650 in., bar dia =.906 in., installed height = 11.00 in., load = 3788 Lbs., spring rate = 1464 lbs/in, free height = 13.591 in.

Note: some of the specs for 6560 and 6560S, spring rate look a little odd, would call to confirm numbers if interested in using.

Will try to check Master GM Truck Parts Catalog to see if they list spring rates for OEM springs for reference.