I just lifted mine (2" B.B.; '99) and am waiting for the A.A.L.s to settle. Then, if I have vibes, I've got some 1.5"x1/4" bar stock that I'll double up. If that doesn't work, I'll add another layer for 3/4" and so on up to one inch (after that, I'll have to look at shims). If your motor mounts are in good shape, I'd recommend loosening the all bolts about a half turn or so before putting in the drop. That will help relieve some tension on them; then you can tighten them back up once the t-case is lowered.