Yukon Gear & Axle Toyota Re-Gear Kits

Reclaim Performance in Big-Tire Toyotas

Toyota owners can now take advantage of performance-engineered Yukon Gear & Axle gear sets that have been proven at King of the Hammers, the granite crags of Moab, and in Ultra4 competition across the country. Yukon’s convenient ring and pinion Re-Gear Kits bundle everything you need to upgrade your Toyota’s front and rear differentials in one simple part number to save you time. These kits feature premium Yukon ring and pinion gears, Master Install Kits with high-quality Timken/Koyo bearings, and all the small parts you’ll need to get your vehicle back on the road quickly so you can make the most of your time on the trail.

There are two main reasons to re-gear your ride. The first is to recapture the lost performance and fuel efficiency of a daily driven vehicle that has been upgraded with larger wheels and tires. The second is to fine tune the performance characteristics of a vehicle that is a dedicated off-roader where the focus is more on low-end grunt and mild acceleration.

Yukon’s Toyota gear program covers 1996-and-up 4Runners, ’95-and-up Tacomas, and 2000-and-up Tundras. This offering encompasses popular Toyota differentials like the 8.75” rear, 8” clamshell front, and 8” rear that is featured on countless V6-powered Toyota 4x4s. Toyota 8” diffs are stout and utilize a third-member, dropout-style design, much like the Ford 9” and Chrysler 8.75” unit. This means the carrier and internals of the diff can be easily removed for ring and pinion upgrades.

Gear Ratio Explained

If you’re adding big tires, you’re technically already re-gearing because the increase in tire circumference changes the final drive ratio. Remember, if your Toyota is running a 4.10 gear, the pinion gear spins 4.1 times to generate one revolution of the ring gear. Further, upsizing tires likely increases the un-sprung weight, or rotating mass, of your rolling stock. This also increases the vehicle’s overall rolling resistance.

On the road, your vehicle will take longer to accelerate, turn a lower engine rpm to maintain a highway speed, and get poor gas mileage because of the increase in weight and rolling resistance. Big tires also put a lot of additional stress on the drivetrain, stock braking system, and factory steering components.

Re-Gearing Explained

A worrisome trend we’ve seen is owners who think that since their rig has a six-, seven-, or eight-speed transmission they don’t have to upgrade their gear set when they jump up in tire size.

The culprit is the increased load of larger tires. It can keep you from realizing the full benefit of the tire upgrade because the transmission won't shift into its higher gears. It's not uncommon to see the transmission hanging out in lower than normal gears at light throttle on the freeway or shuttle shifting while trying to find the right gear. Even if you’re okay with that, the undue stress on the transmission can lead to early failure and a big hit to your wallet. Changing ring and pinion gears is the answer.

Understanding Different Ratios

Gear talk can be confusing. Wheelers have different ways of talking about the same thing—tall gears, high gears, low gears, deep gears. Tall gears produce a lower numeric ratio such as 3.08 or 3.73, while short or deep gears refer to higher numeric ratios such as 4.88 or 5.29.

Numerically higher gear ratios produce more torque, quicker acceleration, and lower top speed. Lower numeric ratios produce less torque, slower launches, and higher top speed. The wrong ratio can reduce fuel economy by forcing the engine to work too hard or spin too fast at freeway speeds. It’s a trade-off.

How to Select a Ratio That’s Right for You

To pick the right ratio, you need to know your current gear ratio and tire height in stock trim. These values determine engine rpm at a given vehicle speed. The homepage provides calculators for gear ratio, tire height, and engine rpm. Use your stock setup as a baseline to understand how your vehicle behaves from the factory.

Enter your new tire diameter and adjust the gear ratio to match stock freeway rpm for factory-like drivability, or tune for more low-end pull or improved fuel mileage depending on your goals.

Going big-tire isn’t as simple as making them fit. Larger tires affect acceleration, cruising, and off-road performance. Yukon Re-Gear Kits restore drivability in one complete solution.

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Yukon Gear & Axle Toyota Re-Gear Kits Highlights

• Re-Gear Kits upgrade your Toyota’s front and rear differentials
• Saves time by bundling everything needed to complete the job correctly
• Regains lost vehicle performance from big-tire upgrades
• Includes Yukon ring and pinion gears with premium Timken and Koyo bearings