And if you're regearing, look into replacing your carriers with a full-carrier locker like a Detroit Locker or LSD like a Detroit Truetrac (nice in front). It's more $$, but a lot more "bang" as well. When I took my D30/D35 from 3.07s (awesome with 33s) to 4.56 (across the 3.73 carrier break) that's what I did.
This is the Pub. Leave common sense at the door.