Yukon Gear 5.29 Ring & Pinion Gear Set | Toyota 8" 4-Cylinder 4WD (1984-95 4Runner / 1979-95 Pickup)
Couldn't load pickup availability
Yukon Gear 4-Cylinder 5.29 Ring & Pinion Gear Set
For 1984–1995 Toyota 4Runner and 1979–1995 Toyota Pickup 4WD with Toyota 8" 4-Cylinder Differential
Overview
The Yukon Gear 5.29 Ring & Pinion Gear Set is a deep-ratio differential upgrade for classic Toyota 4WD applications equipped with the standard Toyota 8-inch 4-cylinder differential. The 5.29:1 ratio is especially well suited to larger-tire builds, heavily equipped vehicles, steep terrain, and applications where increased mechanical advantage is more important than minimizing highway engine speed.
This version uses a 29-spline pinion rather than the factory-style 27-spline configuration found in many original Toyota 8-inch differentials. Vehicles retaining 27-spline pinion hardware require the appropriate 29-spline companion flange, pinion seal, and pinion nut for installation.
Fitment is determined by the differential housing, not engine alone. The standard 4-cylinder Toyota 8-inch third member was commonly used with 20R, 22R, and 22RE applications and is different from the V6/Turbo-style 8-inch differential and the 7.5-inch IFS front differential.
Key Features
- 5.29:1 differential gear ratio
- Designed for the Toyota 8-inch 4-cylinder differential
- Heavy-duty 29-spline pinion
- High-grade steel ring and pinion construction
- Gear tooth surface finishing designed to reduce friction and heat
- Deep gearing improves mechanical advantage for larger tires and low-speed off-road use
- Fits the Toyota 8-inch solid-front-axle applications and rear differentials listed below
- Available with or without 29-spline conversion hardware
- Suitable for lockers and differential carriers designed for the Toyota 8-inch 4-cylinder platform
- Professional differential setup required
Toyota 8" 4-Cylinder Differential Identification
Toyota used different 8-inch third-member designs across these vehicles, so identifying the differential before ordering is important.
Standard 4-Cylinder Toyota 8" Differential
- Commonly found in 20R, 22R, and 22RE applications
- Typically identified by three external reinforcement ribs
- Uses this 4-cylinder-style ring and pinion gear set
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 the separate V6/Turbo-style gear set
Beginning with Toyota's transition to IFS, the front differential changed to a 7.5-inch design. This 8-inch gear set therefore fits the front differential only on the solid-front-axle applications listed below.
Toyota 8" Differential Identification
Toyota used different 8-inch third-member designs across these vehicles, so identifying the installed differential before ordering is important.
Standard 4-Cylinder Toyota 8" Differential
- Commonly found in 20R, 22R, and 22RE applications
- Typically identified by three external reinforcement ribs
- Uses this 4-cylinder-style ring and pinion gear set
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 the separate V6/Turbo-style 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 4-cylinder differential only.
Toyota 4Runner
- 1984–1985 Toyota 4Runner – 1st Gen – Toyota 8" 4-Cylinder Differential – Front & Rear
- 1986–1989 Toyota 4Runner – 1st Gen – Toyota 8" 4-Cylinder Differential – Rear Only
- 1990–1995 Toyota 4Runner – 2nd Gen – Toyota 8" 4-Cylinder Differential – Rear Only
Toyota Pickup
- 1979–1983 Toyota Pickup – 1st Gen – Toyota 8" 4-Cylinder Differential – Front & Rear
- 1984–1985 Toyota Pickup – 2nd Gen – Toyota 8" 4-Cylinder Differential – Front & Rear
- 1986–1988 Toyota Pickup – 2nd Gen – Toyota 8" 4-Cylinder Differential – Rear Only
- 1989–1995 Toyota Pickup – 3rd Gen – Toyota 8" 4-Cylinder Differential – Rear Only
Fitment Notes
- Toyota 8-inch 4-cylinder differential only.
- 29-spline pinion.
- 5.29:1 gear ratio.
- Factory 27-spline applications require a compatible 29-spline companion flange, pinion seal, and pinion nut.
- Does not fit the 7.5-inch IFS front differential used beginning in 1986.
- Does not fit the V6/Turbo-style 8-inch third member.
- Front application is limited to Toyota 8-inch solid-front-axle configurations.
- On 4WD vehicles, front and rear differential ratios must match before engaging four-wheel drive.
- Verify the installed third member if the vehicle has undergone an axle or differential swap.
- Professional installation and differential setup are required.
- Proper 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 4.88 Differential Warning: The uncommon factory G144 4.88 differential uses a specialized third-member housing and should not be treated as a standard aftermarket Toyota 8-inch gear application. Vehicles equipped with this differential require additional third-member verification before ordering.
Product Specifications
Brand: Yukon Gear & Axle
Product Type: Ring & Pinion Gear Set
Differential: Toyota 8" 4-Cylinder
Gear Ratio: 5.29:1
Pinion Spline: 29-Spline
Ring Gear Diameter: 8 Inches
Material: High-Grade Steel
Rotation: Standard
Drivetrain: 4WD
Front Application: 1979–1985 Toyota Pickup / 1984–1985 Toyota 4Runner Solid Axle
Rear Application: 1979–1995 Toyota Pickup / 1984–1995 Toyota 4Runner with Toyota 8" 4-Cylinder Differential
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 4-cylinder Toyota 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 5.29 Ring Gear
- (1) Yukon 5.29 Pinion Gear
- Requires existing compatible 29-spline pinion hardware or separately purchased conversion components
29-Spline Gears + 27-to-29 Spline Conversion Hardware Kit
- (1) Yukon 5.29 Ring Gear
- (1) Yukon 5.29 Pinion Gear
- (1) 29-Spline Companion Flange / Yoke
- (1) Pinion Seal
- (1) 29-Spline Pinion Nut
- Provides the required pinion hardware for converting factory 27-spline configurations to the 29-spline gear set