well i'm never going back!i took the heep in to get the rear shimed as the drive pinion was at 19 and the shaft was at 14 . so had them install 6* shims.they called i picked up.they said it was vibing a little still.i jump in take it up to 60 and its still the same as before. had my baby girl in the car so did not turn around. got home took a look at the perches and the idiots took off the original shims(that come on from rough country)now am i wrong the new shims go with the original equipment that came with the lift because if not i'll need like a 12-13* shim