You don't say what engine, for a 6 cylinder I'd go 4.56's, and for a 4 cylinder 4.88's. 35's is really pushing the limits on stock axles. 33's and a 1" Daystar body lift would be much better. There's nothing good about a 3" body lift in my opinion.
Regearing is definitely better left to the pros, if you have to ask, I wouldn't even consider attempting it.
I can pick my way over a trail with the guys on 35-37" tires on my 33's as I'm on stock axles, and don't have those huge pumpkins to drag over everything. <damn I wish I had that problem>
If you're really gonna go with 35's, carry spare axle shafts with you.
91YJ Sahara, SOA, 4.88's, 35's, Locked