Revolution Gear & Axle 16-24 Toyota Tacoma 8.75in Rear Axle 4.88 Ratio Ring & Pinion Set
If your third-generation Toyota Tacoma now runs bigger all-terrain or mud tires and the six-speed automatic keeps dropping a gear on every highway hill, the axle ratio is the problem. Revolution Gear & Axle T8.75-488 is a 4.88 ring and pinion for the 8.75 inch rear axle that Toyota put under 2016-and-later Tacomas equipped with the factory rear electronic locker. It is also the right replacement when the original rear gears in a locker truck have started to whine.
The pinion takes power from the rear driveshaft and turns the 8.75 inch ring gear, which is bolted to the locking carrier and drives both rear axle shafts. The ratio sets how many driveshaft turns it takes to rotate the tires once. Toyota built the third-generation truck with fairly tall factory gearing, so a larger tire makes the problem worse: every inch of extra diameter is effectively a taller gear. According to Revolution, this set uses a 34-spline pinion, standard rotation, no carrier break and 8620 steel, and it is manufactured in Korea.
First make sure the noise is the axle and not a wheel bearing or the transmission; our transmission vs differential noise guide explains the difference. Then check the axle code on the driver door jamb sticker. Revolution's Tacoma axle guide decodes it: the second and third characters give the factory ratio (for example 06 = 4.30, 07 = 3.909) and a fourth character of B means E-locker. The math for 4.88 is simple. From a factory 3.909, going to 4.88 is about 25 percent more gear, enough to cancel a very large tire increase. From a factory 4.30, 4.88 is about 13 percent more gear, which matches a moderate tire upgrade. Our re-gear after bigger tires guide walks through the calculation.
This set is for Tacomas whose rear axle is the 8.75 inch with a 34-spline pinion, which on the third generation means trucks with the factory rear E-locker. Open-differential Tacomas from the same years use a smaller 8 inch rear with a 29-spline pinion, and this gear will not fit them. Revolution lists the 8.75 set for 2016-2023 trucks; our listing includes 2024, but the 2024 Tacoma is an all-new generation, so 2024 owners should send us their VIN before ordering. On a 4x4 the front 8 inch IFS differential must be changed to 4.88 at the same time, or the driveline binds in four-wheel drive. The simplest way to do both axles is the Tacoma 4.88 gear package, which bundles front and rear gears with Timken master install kits. Trucks with very large tires may want the 5.29 rear set instead.
Use all new pinion and carrier bearings, a new crush sleeve and pinion seal. Revolution's setup chart for the Toyota 8.75 lists a 0.076 inch starting pinion shim, 15-20 in-lb of pinion bearing preload, 0.006-0.010 inch backlash and 70 ft-lb on both the ring gear bolts and the bearing caps. Pulling the axle shafts on a Tacoma is easier with a Tacoma rear axle bearing puller and ABS tone ring kit, and a pinion depth setting tool takes the guesswork out of shimming. Check the E-locker wiring and actuator while the carrier is out. Break the new gears in with easy driving, no towing for the first few hundred miles and an early gear oil change; our break-in procedure has the details.
| Brand | Revolution Gear & Axle |
| Part number | T8.75-488 |
| Fits | Revolution Gear & Axle 16-24 Toyota Tacoma 8.75in Rear Axle 4.88 Ratio Ring & Pinion Set |
| Vehicle fitment | Toyota Tacoma (2016-2024) |
| Type | Ring & Pinions |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. Third-generation Tacomas with an open rear differential use an 8 inch rear with a 29-spline pinion. This 4.88 set is only for the 8.75 inch, 34-spline rear used on E-locker trucks. A fourth character of B in the door-jamb axle code means E-locker.
Revolution catalogs this gear for 2016-2023. The 2024 Tacoma is a new generation, so send us your VIN and we will confirm the rear axle before you order.
On a 4x4, yes. The front 8 inch IFS differential must match the rear ratio or the driveline will bind in four-wheel drive. The Tacoma 4.88 gear package includes both front and rear sets.
Multiply your factory ratio by your stock tire diameter and divide by your new tire diameter. If the result is well below your factory ratio, 4.88 brings it back. Very large tires on a truck that started at 3.909 may call for 5.29.
A master install kit with pinion and carrier bearings, shims, crush sleeve and pinion seal, plus gear oil. The gear package version already includes Timken install kits for both axles.
