« on: Jun 22, 2016, 12:02:25 PM »
Toyota matched diff gears to trans and tire size, assuming you are going with 3rd gen or older drivetrain, that would be 4.10's for 5-spd w/28's, or 4/3?'s w/28's. 37's are 24.3% bigger than 28's, 5.29's are 22.5% taller, while 4.88's are only 16% taller, 6.5% isn't a lot, but then 37's will weigh more and have a greater rolling resistance, so that needs to be considered as well.
If you are buying new gears, go with the 5.29's, if you already have the 4.88's run them and see if the performance is tolerable, then decide if regearing is needed/wanted.
4.88s match up pretty much perfectly with a 35 inch tire. The math give you 34 inches, but between many of them being less than 35 plus the rolling diameter is even less from the weight of the vehicle. I think my speedo on my 4Runner is more accurate with 4.88s and my 35 inch Cooper SST Pros than my Sequoia is with one size taller tires.
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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
