you have to do everything to go bigger than 35 and be a reliable trail rig. If it is a grocery getter then you can cut a lot of corners.
that includes a 1 ton axle swap, springs, shackle flip, cross over steering, 205 t-case (I used an ord magnum for an adaptor). CV joint outputs front and rear of t-case.
new shocks, extended shock mounts, longer brake lines, longer parking brake line. New drive shafts or modified existing to vv joint and larger yokes. a cross member change or modification. Possibly a t-case drop kit.
If you do all that then you might as well put a locker in the front and add hydro steer and a 4l80e. I have done all of this to my truck. I have posted most of it. search my post and you will see the large amount of work and money required.
It is no small job or a cheap job to do it right.