Re: K10 rear springs q and a
^^ That sounds right to me. Stock spring length is 52" and K10 & K20 packs are interchangeable as far as fit. Thickness & load capacity will vary of course.
OP, if your truck has 56" springs, they have been swapped in by a previous owner.
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- Mike -
1972 K20 LWB 350/350/205
RIP El Jay
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