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Re: 3/4 ton frames...question
You can switch a C20 over to a C10 using the '71-'87 suspension. You didn't say if the '66 Suburban in question is a Chevy or a GMC. The GMC's could have either leafs or coils in the rear. Being as it's a C20 my guess would be on leafs if it is a GMC.
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