I used to have a 2 1/2". 33's will be tight but you'll be just fine. Don't really need a transfer case drop with a 2 1/2. The only thing you might need, and I never had to do it but one broke, is get 2 1/2 inch lift size sway bar links. And there ya go. Don't need to regear with a 4.0. If you have a 2.5L, if you have 4:10 or 4:88 you'll be fine. If not, you'll want to regear. You don't have to, but it'll be sucha turd it'll frustrate you.