Question for all of you out there with gearing expertise:

I have the 4.272 gears in my diffs. If I just change out the T case gears to 3.15's, would that lower my ratio enough to wheel with 35 inch tires without changine my diff gears from 4.272?? Or should I upgrade my diff gears to 4.90's as well if I want to wheel with 35's on the rims??

97 Montero SR w/Mitsu Adj Shocks & Rear Diff Lock ARB Front Diff Lock 4.9 Ring/Pinion 3.15 transfer box 43:1 crawl ratio 2" suspen lift 2" body lift 2" Gas Tank Lift 35x12.5 MTRs 15x10 Wheels Rock Sliderz ARB front bumper w/12k winch Custom rear bumper