[1977ChevGMCK2025Fan]

Originally Posted by MJN

This is somewhat incorrect. K20's had 14 bolt full floater rear axles as standard equipment, the 9.5" semi-float 14 bolt didn't come around until '81. Yes- K20's from 1981 and after had the semi float but they could also have come equipped with the full floater depending on the GVWR.
K30 frames are 8" tall behind the cab vs 6" tall on a K20
K30 rear shocks are located inside the frame vs. outside the frame on a K20
Lots of rear spring info in these info packets outlining the different spring packs between the two;
https://www.gmheritagecenter.com/doc...olet-Truck.pdf

Thank you!
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