Be sure to check the frame Height, I had the same problem, and it turned out to be the crossmembers of the box were our of whack, I ended up changing those to correct the Droop in the one side.
Good luck.
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Not Grandpa's C-20 anymore...
383 Stroker 425HP, 485Ft/Lbs
Lowered 3.5" Front / 5" Rear
66,000 miles.
Alberta, CANADA
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