Yukon Gear 4.88 Ring & Pinion Gear Set | Toyota 8" V6 / Turbo 4WD (1986-95 4Runner / 1986-95 Pickup)
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Yukon Gear V6/Turbo 4.88 Ring & Pinion Gear Set
For 1986–1995 Toyota 4Runner and 1986–1995 Toyota Pickup 4WD with Toyota 8" V6/Turbo Rear Differential
Overview
The Yukon Gear V6/Turbo 4.88 Ring & Pinion Gear Set is a differential gearing upgrade for Toyota 4WD trucks and SUVs equipped with the Toyota 8-inch V6/Turbo rear third member.
The 4.88:1 ratio increases mechanical advantage compared with taller factory gearing, making it a popular choice for vehicles running larger tires while retaining a balance between low-speed off-road performance and highway use.
This gear set uses a 29-spline pinion. Factory 1986–1995 V6/Turbo differentials commonly use 27-spline pinion hardware, so the appropriate 29-spline companion flange, pinion seal, and pinion nut are required when converting an original differential. Fitment is determined by the installed third member, not engine alone.
Key Features
- 4.88:1 ring and pinion gear ratio
- Designed for the Toyota 8" V6/Turbo rear differential
- 8.125-inch ring gear diameter
- Heavy-duty 29-spline pinion
- 10 ring gear bolts
- High-grade steel ring and pinion construction
- Gear-tooth surface finishing designed to reduce friction and heat
- Increased mechanical advantage for larger tires and off-road use
- Available with or without 27-to-29 spline conversion hardware
- Professional differential setup required
Toyota 8" V6/Turbo Differential Identification
Toyota used different 8-inch third-member configurations across these vehicles, so the installed differential should be identified before ordering.
V6/Turbo Toyota 8" Differential
- Typically has four reinforcement ribs on each side
- Features a distinctive trapezoid-shaped upper rib
- Used behind factory 22R-TE Turbo and 3VZ-E V6 applications
- Uses this V6/Turbo-style ring and pinion gear set
Standard 4-Cylinder Toyota 8" Differential
- Typically has three reinforcement ribs on each side
- Commonly found behind 20R, 22R, and 22RE engines
- Uses the separate 4-cylinder Toyota 8-inch gear set
Because Toyota 8-inch third members can be swapped between many applications, always identify the actual differential housing rather than relying solely on the vehicle's engine.
Toyota 8" Differential Identification
Toyota used different 8-inch third-member designs across these vehicles, so identifying the installed differential before ordering is important.
V6 / Turbo Toyota 8" Differential
- Typically identified by four reinforcement ribs and a trapezoid-shaped upper rib
- Commonly associated with 22R-TE and 3VZ-E applications
- Uses this V6/Turbo-style ring and pinion gear set
Standard 4-Cylinder Toyota 8" Differential
- Commonly found in 20R, 22R, and 22RE applications
- Typically identified by three external reinforcement ribs
- Uses the separate 4-cylinder-style ring and pinion gear set
Because Toyota 8-inch third members are frequently swapped between vehicles, verify the actual differential installed rather than relying solely on engine type.
Vehicle Fitment
4WD models with the Toyota 8-inch V6/Turbo rear differential only.
Toyota 4Runner
- 1986–1987 Toyota 4Runner – 1st Gen – 22R-TE Turbo – Toyota 8" V6/Turbo Differential – Rear Only
- 1988–1989 Toyota 4Runner – 1st Gen – 3VZ-E V6 – Toyota 8" V6/Turbo Differential – Rear Only
- 1990–1995 Toyota 4Runner – 2nd Gen – 3VZ-E V6 – Toyota 8" V6/Turbo Differential – Rear Only
Toyota Pickup
- 1986–1987 Toyota Pickup – 2nd Gen – 22R-TE Turbo – Toyota 8" V6/Turbo Differential – Rear Only
- 1988 Toyota Pickup – 2nd Gen – 3VZ-E V6 – Toyota 8" V6/Turbo Differential – Rear Only
- 1989–1995 Toyota Pickup – 3rd Gen – 3VZ-E V6 – Toyota 8" V6/Turbo Differential – Rear Only
Fitment Notes
- Rear differential application only
- Toyota 8-inch V6/Turbo third member required
- Does not fit the standard 4-cylinder Toyota 8-inch third member
- Does not fit the Toyota 7.5-inch IFS front differential
- 4.88:1 gear ratio
- 29-spline pinion
- Factory 27-spline configurations require a compatible 29-spline companion flange, pinion seal, and pinion nut
- On 4WD vehicles, front and rear differential ratios must match before engaging four-wheel drive
- Verify the installed differential on vehicles with axle, engine, or third-member swaps
- Professional installation and differential setup are required
- Correct pinion depth, bearing preload, backlash, and gear contact pattern must be established during installation
- Proper ring-and-pinion break-in should be completed after installation
Factory G144 4.88 Differential: The factory G144 V6 4.88 third member uses a unique offset housing and thinner factory ring gear. Standard aftermarket ring and pinion sets do not fit this housing. A standard Toyota V6/Turbo 8-inch third member is required before installing aftermarket gears.
Product Specifications
Brand: Yukon Gear & Axle
Product Type: Ring & Pinion Gear Set
Position: Rear
Differential: Toyota 8" V6/Turbo
Gear Ratio: 4.88:1
Ring Gear Diameter: 8.125 Inches
Pinion Spline: 29-Spline
Ring Gear Bolts: 10
Material: High-Grade Steel
Drivetrain: 4WD
Warranty: 1-Year Limited Warranty
Installation: Professional Differential Setup Required
Choosing 4.56 vs. 4.88 vs. 5.29 Gears
Gear-ratio selection should account for tire diameter, tire and wheel weight, transmission, permanent vehicle weight, highway use, terrain, and future tire plans. Larger or heavier tires reduce effective gearing, while bumpers, winches, sliders, skid plates, recovery gear, spare-tire carriers, roof racks, tools, and camping equipment increase the load the drivetrain must move.
The ranges below are Preserve Rad selection guidance for Toyota V6/Turbo 4WD builds rather than hard fitment limits. Two vehicles with the same tire diameter can benefit from different gearing when their transmissions, wheel/tire weights, permanent equipment, terrain, or highway usage differ.
Gear Ratio Selection Guide
| Gear Ratio | Best Tire Range | Typical Sweet Spot | Added Equipment | Best Use | What to Expect |
|---|---|---|---|---|---|
| Yukon 4.56 | 30–32 in. | 31 in. | Stock to lightly modified; approximately 0–200 lb of permanent added equipment | Daily driving, highway use, light trail use | Balanced cruising RPM and acceleration; mildest gearing of these three ratios |
| Yukon 4.88 | 32–34 in. | 33 in. | Moderately equipped; approximately 200–500 lb of permanent added equipment | Mixed street/trail use, hills, moderate overland builds | Strong all-around choice for 33-inch tires with more mechanical advantage than 4.56 |
| Yukon 5.29 | 34–36+ in. | 35 in. | Heavily equipped; approximately 500+ lb, or a particularly heavy wheel/tire package | Trail use, mountain driving, heavy overland builds, low-speed use | Most mechanical advantage of these three ratios, with higher highway engine RPM |
Tire Size & Vehicle Weight Guide
| Tire Size | Light / Near-Stock Build | Moderately Equipped | Heavy / Trail-Focused Build |
|---|---|---|---|
| 30–31 in. | 4.56 | 4.56 | 4.88 |
| 32 in. | 4.56 | 4.88 | 4.88 |
| 33 in. | 4.88 | 4.88 | 4.88–5.29 |
| 34 in. | 4.88 | 4.88–5.29 | 5.29 |
| 35 in. | 5.29 | 5.29 | 5.29 |
| 36–37 in. | 5.29 | 5.29 | 5.29 |
Tire weight matters, not just diameter. A heavy mud-terrain tire on a steel wheel places more demand on the drivetrain than a lighter tire and wheel combination of the same diameter because the drivetrain must accelerate additional rotating mass.
Permanent vehicle weight can justify deeper gearing. Steel bumpers, winches, armor, sliders, skid plates, spare-tire carriers, tools, recovery equipment, camping gear, and other permanently carried equipment increase the load the engine must move. The weight ranges above are general selection guidance rather than fixed cutoffs.
Transmission and highway use matter. Automatic-transmission trucks and vehicles that spend substantial time climbing grades or carrying weight may favor deeper gearing sooner, while a lighter manual-transmission truck that spends most of its time at highway speed may favor the less aggressive ratio when tire size allows.
Future tire size matters. If a truck is currently on 33-inch tires but is being built around a planned move to 35-inch tires, choosing 5.29 gears can make more sense than gearing only for the current tire size and paying for another differential setup later.
Available Configurations
29-Spline Gears Only (Requires Conversion Hardware)
- (1) Yukon 4.88 Ring Gear
- (1) Yukon 4.88 Pinion Gear
- For applications already equipped with the required 29-spline pinion hardware
29-Spline Gears + 27-to-29 Spline Conversion Hardware Kit
- (1) Yukon 4.88 Ring Gear
- (1) Yukon 4.88 Pinion Gear
- (1) 29-Spline Companion Flange / Yoke
- (1) Pinion Seal
- (1) 29-Spline Pinion Nut
- Provides the pinion hardware required to convert factory 27-spline configurations