35's you'll need to re gear and find a new rear axle for sure. 33's regear and maybe a new rear axle, that depends how hard you plan to wheel it. Some guys have good luck with the Dana 35 and 33's and some don't, I got by with that combo but was nervous as it was all stock. If you up grade it with cromo axles you might be fine if you don't push it to hard. Bottom line your rear end is you major hold back IMO.
If you don't push the limits how do you find them??