Revolution Gear & Axle Toyota 7.5in 4.88 Ratio Ring & Pinion Set
A 1986-1995 Toyota Pickup or 4Runner on 33 inch tires usually ends up at 4.88 gears, and the job is never one axle. The rear 8 inch gets a 4.88 set, and the 7.5 inch independent front differential has to match it exactly or the truck binds the moment you pull the transfer case lever. The Revolution Gear and Axle T7.5-488 is the front half of that pair: a new 4.88 ring and pinion for the standard-rotation Toyota 7.5 with a 23-spline pinion. It is also the set to reach for when an old front diff whines in four-wheel drive and the teeth show pitting at the oil change.
On these trucks the front differential bolts to the frame and drives the wheels through CV shafts. When 4WD is engaged, the front driveshaft turns the pinion, the pinion drives the 7.5 inch ring gear, and the carrier splits that torque to the two sides. At 4.88 the pinion turns 4.88 times for each turn of the front wheels, which is what lets a four-cylinder turn 33 inch tires in low range without stalling or slipping the clutch. Because the front and rear are locked together through the transfer case, the front ratio is not a choice: it must equal the rear. Revolution cuts this set from 8620 steel in Korea, and the ring gear uses ten 10mm bolts. Revolution lists no carrier break for the standard-rotation 7.5, so 4.56, 4.88 and 5.29 all mount on the same carrier.
Toyota did not use one front differential for every engine. Our Toyota 7.5 IFS front differential guide explains that most four-cylinder IFS fronts take standard-rotation gears like these, while V6 fronts generally use a reverse-rotation 7.5 with a different pinion and bearings. Pull the cover, count the ring gear bolts and the pinion splines, and read the current ratio from the tooth counts or by turning the driveshaft. Then check the rear ratio, because the whole point is a match. If you are still choosing a number, the regear after bigger tires guide walks through the math for 31, 33 and 35 inch tires.
Revolution lists this set for Toyota 7.5 inch standard-rotation differentials and names the 1986-1995 Pickup and 1984-1995 4Runner. The IFS front arrived in 1986; earlier solid-axle trucks used a larger front differential, so a 1984-1985 4Runner should be measured before you order. The 7.5 also appears as a rear axle in some two-wheel-drive Toyota pickups, and the USA Standard 4.56 Toyota 7.5 set page lists those rear applications. This set does not fit the reverse-rotation fronts in the 1996-2004 Tacoma, 1996-2002 4Runner and 2000-2006 Tundra; for those, use the Yukon reverse-rotation Toyota 7.5 4.88 set. Match the spline count and bolt count on your old pinion and ring gear, or send us your year and VIN and we will check it. Other axle parts are in our hard parts catalog.
Every new gear set needs new pinion and carrier bearings, races, a crush sleeve and a pinion seal. On 1986-1989 trucks with 45mm carrier bearings, the Revolution 1986-1989 Toyota 7.5 IFS master install kit supplies those parts; for four-cylinder fronts the Yukon four-cylinder Toyota 7.5 bearing install kit is the bearing-only option. Revolution's setup chart for the Toyota 7.5 starts the pinion at 0.095 in, sets new pinion bearing preload at 12-15 in-lb and backlash at 0.006-0.010 in, and torques the ring gear bolts and bearing caps to 70 ft-lb. Use the original shim pack as a starting point, apply thread locker to the ring gear bolts, and check the drive and coast pattern with marking compound before the diff goes back in the truck. Revolution's break-in advice is a non-synthetic GL-5 gear oil, several short drives with cool-down stops, no towing at first, and an oil change at about 500 miles. Our ring and pinion break-in procedure lays that out step by step.
| Brand | Revolution Gear & Axle |
| Part number | T7.5-488 |
| Fits | Revolution Gear & Axle Toyota 7.5in 4.88 Ratio Ring & Pinion Set |
| 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. The 1996-2004 Tacoma 4WD front uses a reverse-rotation 7.5 gear. This T7.5-488 is standard rotation, listed by Revolution for 1986-1995 Pickup and 1984-1995 4Runner.
Revolution lists a 23-spline pinion, a 7.5 inch ring gear and ten 10mm ring gear bolts, made from 8620 steel, with no carrier break.
Yes. Front and rear must run the same ratio on a 4WD truck. On a 1986-1995 Pickup or 4Runner the rear is the 8 inch axle, which needs its own 4.88 set.
No. It is the ring and pinion only. Plan on a master install kit or bearing kit for your year and engine, plus a crush sleeve and pinion seal.
Revolution recommends a non-synthetic GL-5 gear oil for break-in and an oil change at about 500 miles, then the gear oil your owner's manual calls for.
