You finally got 35s under your 6th gen 4Runner or 4th gen Tacoma, the stance looks right, and now the truck feels like it's towing an invisible trailer up every on-ramp. That's the gearing tax. Bigger tires change your effective final drive ratio, and on the new-generation Toyotas the question of whether to regear isn't as simple as it was on the older trucks. Here's how to know if you actually need it, what ratio to run, and why the i-FORCE MAX might let some of you skip it entirely.
Why Bigger Tires Wreck Your Gearing
Your axle gear ratio is tuned around stock tire diameter. The factory 4th gen Tacoma runs roughly 3.58 gears, and the 6th gen 4Runner sits in the same high-3s ballpark. Those numbers were chosen for the stock 32-ish-inch tires the trucks ship on. Bolt on a 35 and you've added almost three inches of diameter, which is like stretching your gearing taller without your consent. The engine now has to spin a heavier, larger-circumference tire, so it works harder, the transmission hunts for gears, and your real-world acceleration, towing grunt, and crawl ratio all drop.
The rule of thumb builders have used for years: every jump in tire size wants a numerically higher (lower) gear to bring your effective ratio back to stock. Going from ~32s to 35s on these trucks typically calls for something in the 4.56 to 5.29 range depending on the platform and how heavy your build is.
The New-Gen Wrinkle: 8-Speed Autos and the Hybrid
Here's what changed. The new 4Runner and Tacoma run an 8-speed automatic instead of the old 6-speed, and the gas trucks use a turbo 2.4L while the top trims get the i-FORCE MAX hybrid. That matters for two reasons.
First, the 8-speed has more ratios to play with, so it can downshift to mask some of the deficit from bigger tires. It's not a substitute for proper gears, but it does make 35s on stock gearing more livable than it ever was on a 6-speed.
Second, and this is the big one: the i-FORCE MAX hybrid makes 326 horsepower and 465 lb-ft of torque, and that torque comes on almost instantly thanks to the electric motor. That low-end shove papers over a lot of the gearing penalty. Plenty of hybrid owners are running 35s and reporting the truck still feels strong because the motor fills in exactly where a non-regeared truck would feel gutless. If you've got the i-FORCE MAX and you mostly daily drive with occasional trail use, you may genuinely be fine on stock gears.
When You Actually Need to Regear
Skip the regear if: you're on the hybrid, your build is relatively light, you stick to 33s or moderate 34s, and your driving is mostly pavement with weekend trails. The combination of the 8-speed and that hybrid torque covers you.
Regear if any of these are true:
- You're running true 35s and the truck is built heavy — bumpers, sliders, a rack, a fridge, drawers, recovery gear. Weight compounds the gearing deficit fast.
- You have the gas turbo 2.4L, not the hybrid. Without the electric torque fill, 35s on stock gears feel noticeably sluggish, especially at altitude or towing.
- You tow. Trailer plus 35s plus stock gears is the fastest way to cook a transmission with constant hunting and high heat.
- You crawl. Bigger tires raise your crawl ratio, making low-speed technical sections harder to modulate. Lower gears bring that control back.
What Ratio to Run
For the 4Runner on 35s, 4.56 is the balanced street-and-trail choice for a moderately built rig, and 4.88 is the call for a heavy 35-inch build that lives off-road. On the Tacoma, builders running 35s lean toward 4.88 for a mixed-use truck, with 5.29 recommended for a heavy overland setup that's loaded down most of the time. The heavier and more trail-focused you are, the more you want the numerically higher gear.
Don't overthink the half-step debates. The difference between 4.56 and 4.88 is real but small for daily feel; pick based on weight and how often you're loaded. If you're on the fence and the rig is built out, go one step deeper than you think you need — almost nobody regrets having slightly lower gears, and plenty of people regret going too tall.
Cost and Who Does the Work
Regearing isn't a driveway job for most people — setting up ring and pinion backlash and pinion depth correctly takes specialized tools and experience, and a bad setup means whining diffs or grenaded gears. Quality gear sets come from Nitro Gear, Yukon, Revolution Gear & Axle, and similar names, and you'll usually want new bearings, seals, and a setup kit at the same time. Plan on a ballpark of roughly $2,500 to $4,500 for both front and rear installed, depending on your shop, parts, and region. Doing one diff is cheaper but unbalanced — match front and rear so the truck behaves predictably.
One note for the new platform: aftermarket gear availability for the 6th gen 4Runner and 4th gen Tacoma took a while to mature, so confirm your shop has verified sets for your exact axle before you book the install. Don't assume 3rd gen Tacoma or 5th gen 4Runner parts carry over — they don't.
Bottom Line
Regearing for 35s on the new trucks comes down to drivetrain and build weight. Hybrid plus light build plus mostly pavement: you can probably leave it alone. Gas turbo, or a heavy 35-inch trail and overland rig: regear, and pick 4.56 to 5.29 based on weight. Drive it stock for a few weeks first so you actually feel the deficit before you spend the money — then you'll know exactly which ratio your truck is asking for.
If you're tracking parts for your build, Build List Garage is the easiest way to log everything in one place — gear ratios, install dates, part numbers, every line item — and share your rig with one link. Download it free from the App Store and stop keeping your build in a notes app.