I have a small vibe in the rear end, and I am about to add the ORD 1" add a leaf. Is it better to drop the tcase, or shim the pinion? I would like to avoid dropping the tcase so I don't loose ground clearence. Oh ya, I have a 21/2" lift (addaleaf) which has sagged to about 2"s. Any input helps. What degree shim, or how far should I drop the tcase. Any input helps. Thanks My Chevy isn't broken, its just out of gas.