So found something interesting...evidently Yukon Gear and axle has rolled out 3.70 gears from the rear axle of FZJ80s. I e-mailed them about when they'll be rolling out the 3.70 for the front, and also asked about 3.55 gears. They also now have front and rear zip lockers available. The R&P sets are coming in at $250-300 bucks....way lower than some of those other companies out there. Do you think 3.70 would be good for 315's? Or are 3.55's best for comfortable highway cruising. I really am not super hot on running 37's for this project.
Intresting! So are they making a HP 8" gear in 3.70?
If you are maxing out at 315's I would go with the 3.55's higher gearing the better.