If you ever want to goto 33s, you'll want 4.88s.........
You might want 4.88s with the 31s, so throw that in the mix............
My 85 ran pretty strong in Colorado with 32 inch tires and 4.10 gears. I am currently running 4.88 years with 35 inch tires in my 89. I first ran the 4.88 gears in my 85 with 33 inch tires. It was a great combo and the 33 inch tires were just too much for the 4.10 gears.
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1989 4Runner: Dual Ultimate (Inchworm front & Marlin 4.70 rear), Marlin Twin Stick, 1200-lb clutch, 4.88 R&P, Aussie Front, Detroit rear, 30-spline Longs, Long hub gears, ARP hub and knuckle studs & 35x12.50 Cooper STT PRO tires. Marlin rear bumper & sliders. FROR front bumper. SAS with Alcan springs & Rancho 9000XL shocks. Budbuilt Bolt-on traction bar. Custom Interior Cage by Those Guys Rod and Customs.
Moab Tested & Rubicon Approved