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I put a set of those coil type overload springs that go between the axle and frame rail bump stop brackets on my 74 K20 so I could heap up a big load of sand on it while I was plowing..they cost about 20 bucks at Autozone--the ones I got were 1500lb capacity,but they said they could order 2000 lb ones too..they worked great,they keep the springs from breaking,and my truck actually rode BETTER with them in it,even empty!--it had 9 leaves in the rear springs,but they rode like dead axles..way too stiff,especially empty..
When I added the coils,it took the weight off the leafs some,and gave it some "bounce" instead of feeling like a solid axle..I removed the rubber bump stops and bolted a Mcpherson strut "hat" off a FWD car to the brackets the rubber bumpers went to,and the coil helpers fit nicely inside the "hat"..kept them from sliding around on the brackets,and made sure they could not slip sideways when empty...I probably should have saved the springs and the "hats",but they were pretty rusty--so they went to the crusher with the rest of the truck..I'd buy another set in a heartbeat though...they really did help a lot!...