[b454rat]

I mentioned 78/79 3/4 ton cause they are leave spring, not coils. You can use 77-older 1/2 ton with coils, they have welded on Cs, so grind em off and weld on spring perches. Do not use 78/79 1/2 ton with coils, as there is no tube where the Cs are, they are "molded" into the tube. 77-older 3/4 ton is low pinion, it would work but driveshaft angle would be steep with a lifted truck such as OP has.