Toyota Regear Chart: Tire Size vs Gear Ratio vs RPM

Bigger tires make your truck taller and your gearing longer. A 35″ tire turns fewer times per mile than a 31.6″ tire, so at the same engine speed you go faster, and at the same road speed your engine turns slower and makes less power. The automatic hunts for gears on every hill, the torque converter runs hot, mileage drops and crawl control feels lazy. Regearing the axles puts the engine back where it makes power.

This chart is pure math, not opinion: highway RPM for every common Toyota axle ratio and tire size, plus the factory ratios by truck so you know your starting point.

Factory Axle & Top Gear Ratios by Truck

Axle ratios for the 2nd gen Tacoma, 5th gen 4Runner and FJ Cruiser come from Toyota spec data and long-standing owner confirmation. A few sources list the GX460 at 3.727 rather than 3.909, so check the axle tag or count the teeth if you are not sure. The fastest way to confirm your own ratio is the tag on the diff housing or the axle code on the door jamb label.

Highway RPM Chart: 5-Speed Automatic Trucks

For the 5th gen 4Runner, FJ Cruiser automatic, 2nd gen Tacoma V6 automatic and GX470 (A750, 0.716 top gear), engine RPM at 65 mph in 5th gear:

How to read it: a stock 4Runner on 31.6″ tires turns about 1,840 RPM at 65 mph. Put it on 35s with stock 3.73s and that drops to about 1,670, which is why the transmission starts downshifting on every grade. 4.56s on 35s put you at 2,040, a little higher than stock, which is usually what a loaded truck wants. 4.88s on 35s (2,180) feels like a stock truck with a heavy right foot.

Highway RPM Chart: 3rd Gen Tacoma 6-Speed Automatic

3rd gen Tacoma V6 automatic (AC60, 0.580 top gear), RPM at 65 mph in 6th gear:

The 3rd gen's very tall 6th gear (0.580) is the reason these trucks feel flat on bigger tires even before you add weight. The 3.5L 2GR-FKS makes its torque high in the rev range, so 3rd gen owners feel a regear more than most. See our 2GR-FKS problems guide for that engine.

Highway RPM Chart: 4th Gen Tacoma 8-Speed Automatic

4th gen Tacoma automatic (i-FORCE and i-FORCE MAX, 0.651 top gear), RPM at 65 mph in 8th gear:

The turbocharged 2.4L makes its torque low in the rev range and the 8-speed has closely spaced gears, so 4th gen Tacomas tolerate bigger tires on stock gears better than any previous Tacoma. The aftermarket for 4th gen ring and pinion sets is also still young, so check availability before you plan a build around a specific ratio.

The "Restore Stock" Math

To put the engine back exactly where Toyota had it, multiply the stock ratio by the new tire height divided by the stock tire height:

New ratio = stock ratio × (new tire ÷ stock tire)

Pick the next available ratio at or above the number in the table. Then go one step higher if the truck is heavy: steel bumpers, a winch, sliders, a rooftop tent, a fridge and a drawer system can easily add 600–1,000 lb, and the engine feels every pound. That is why the restore number for a 4Runner on 35s is about 4.13, yet most built 4Runners on 35s run 4.56 or 4.88.

Which Ratios Fit Which Toyota Diff

Regear both axles to the same ratio. On a 4x4, a front and rear mismatch binds the drivetrain in 4WD and can destroy the transfer case or a front diff. This is not optional.

Is a Regear Worth It?

A quality ring and pinion install on both axles typically runs in the low thousands of dollars at a shop that does Toyota gears regularly, more if you add lockers while the diffs are apart. What you get back:

• Fewer downshifts. The automatic holds top gear on grades instead of hunting, which is easier on the torque converter and the transmission.
• Cooler transmission temps. Hunting and converter slip make heat. On a heavy rig pulling grades or towing, that heat is what kills automatics.
• Better crawl control. Deeper gears multiply torque at the wheel, so you use less throttle and less clutch (or converter) slip off-road.
• Mileage. It rarely gets better than stock after bigger tires, but a regear usually recovers some of what you lost because the engine stops lugging.

When it is not worth it: a lightly built 4th gen Tacoma on 33s, or any truck that went from 31.6″ to 32.7″ and still drives fine. The 4th gen's 8-speed and turbo torque cover a lot of ground before gears matter.

A Note on Accuracy

These charts use nominal tire diameter. Real tires squat under load and measure a little shorter, so actual RPM runs about 2–3% higher than the chart. Two tires sold as the same size can differ by half an inch in real height, which matters more for speedometer calibration than for picking a ratio. For a matching speedometer after the regear, recalibrate with a tuner or programmer that supports your truck.

Frequently Asked Questions

What gear ratio do I need for 35s on a 4Runner?

The math to restore stock gearing on a 5th gen 4Runner (3.727 on 31.6″ tires) says about 4.13 for 35″ tires. Most built 4Runners on 35s run 4.56, and heavy overland rigs often go to 4.88. At 65 mph, 4.56s on 35s turn about 2,040 RPM in 5th gear versus about 1,840 for a stock truck.

Should I run 4.56 or 4.88 for 35s?

For a lightly built truck that is mostly driven on the highway, 4.56. For a heavy truck with armor, a rooftop tent and gear, or one that tows or climbs long grades, 4.88. On a 5-speed automatic Toyota at 65 mph, 4.56s on 35s land about 200 RPM above stock and 4.88s about 340 RPM above stock.

What is the stock gear ratio on a 3rd gen Tacoma?

The 2016–2023 Tacoma V6 with the 6-speed automatic uses a 3.909 axle ratio. V6 manuals and the 2.7L four-cylinder use 4.300. The 4th gen Tacoma (2024+) automatic uses 3.583.

Do I need to regear for 33s?

Usually not. On most Toyotas, 33″ tires (32.7″–33.8″ actual) lower highway RPM by 100–200 RPM, which the engine handles fine on a lightly built truck. If the truck is heavy, tows, or the transmission constantly hunts between gears on hills, a regear to 4.56 helps.

Can I regear only the rear axle?

Not on a 4x4. The front and rear axles must have the same ratio, or the drivetrain binds in 4WD and can break the transfer case or front diff. Two-wheel-drive trucks only have a rear diff to change.

What ratios are available for the Toyota 8.2-inch rear?

Most gear manufacturers offer 4.56 and 4.88 for the 8.2″ rear used in the 2010+ 4Runner, FJ Cruiser and GX460. At least one maker, Yukon, also offers 5.29. Open and locker diffs use different gear packages, so confirm which axle you have before ordering.

How do I find my truck's axle ratio?

Look for the axle code on the door jamb certification label, or the metal tag bolted to the differential. You can also count the teeth: ring gear teeth divided by pinion teeth equals the ratio (for example, 41 ÷ 11 = 3.727).

Related Toyota Guides

• Fitting 35-Inch Tires on a 5th Gen 4Runner: Build Guide
• Biggest Tires on a Stock FJ Cruiser: Fitment Guide
• Biggest Tires That Fit Stock 3rd & 4th Gen Tacomas
• Biggest Tires on a Stock Lexus GX470 & GX460
• 285/75R17 vs 33x12.50R17: Head-to-Head Tire Comparison
• Toyota 1GR-FE 4.0 V6 Engine Guide
• Tire Fitment Hub