I can see a gear swap from 3.55 to the 2's if you go on a lot of 2+ hour drives. Might want to try to go 2.5" exhaust after the mufflers to bumper to quiet it down. I have 3.55 with 275/60/15's on my sb demon I usually keep it at about 2,800rpm which is about 63mph, when I get above that speed the road and wind noise become more of a pain.