Yukon Gear 4-Cylinder Master Differential Overhaul Kit (1979-85 4Runner/Pickup)
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Yukon Gear 4-Cylinder Master Differential Overhaul Kit
For 1984–1985 Toyota 4Runner & 1979-1985 Toyota Pickup Equipped with a 20R, 22R, & 22RE Engine and Toyota 8-Inch Differential
Overview
Restore the reliability and performance of your Toyota 8-inch rear differential with the Yukon Gear Master Differential Overhaul Kit. Designed specifically for 1979–1985 Toyota Pickup and 1984–1985 Toyota 4Runner models equipped with 20R, 22R, or 22RE engines, this complete rebuild kit includes the premium components required for a professional-quality differential overhaul.
Whether you're rebuilding a worn factory third member, replacing aging bearings and seals, or installing a new Yukon ring and pinion gear set, this master kit provides everything needed for an accurate and dependable installation.
Built around premium Timken® bearings and races, Yukon Master Overhaul Kits are trusted by restoration enthusiasts, professional installers, and off-road builders for their precision fitment, durability, and long service life.
Features
- Complete master differential overhaul kit for Toyota 8-inch rear differentials
- Premium Timken® carrier and pinion bearings
- Includes carrier races, pinion races, seals, shims, hardware, and installation components
- Designed specifically for Toyota 8-inch differential applications
- Ideal for ring and pinion gear installations
- Excellent solution for rebuilding worn factory differentials
- Application-specific components for precise fitment
- Manufactured by Yukon Gear & Axle
- Suitable for street, restoration, towing, and off-road use
What's Included
Each Yukon Master Differential Overhaul Kit includes:
- Carrier bearings
- Carrier bearing races
- Inner pinion bearing
- Outer pinion bearing
- Pinion bearing races
- Pinion seal
- Complete shim kit
- Ring gear bolts
- Pinion nut
- OEM-style crush sleeve
- Oil slingers and baffles
- Differential gasket
- Thread-locking compound
- Gear marking compound with application brush
Choose the Correct Spline Configuration
27-Spline (Factory Configuration)
Select this option if your differential uses the original factory-style 27-spline carrier and standard ring and pinion setup. No carrier bearing conversion is required.
29-Spline (Yukon Performance Upgrade)
Select this option if you are installing a Yukon 29-spline ring and pinion gear set.
This package includes:
- Yukon Master Differential Overhaul Kit
- (2) Required 45mm-to-50mm carrier bearing conversion bearings
Everything needed for the installation is included, eliminating the need to source additional components separately.
Available Kit Options
Choose the overhaul kit that matches your differential build.
OEM Open Differential Master Kit
Designed for factory Toyota 8-inch open differentials using the original carrier configuration.
Aftermarket Locker Master Kit
Designed for aftermarket differential carriers including:
- ARB Air Locker
- Eaton E-Locker
- Yukon Grizzly Locker
- Other aftermarket lockers designed for 1979–1985 Toyota 8-inch rear differentials
Each option includes the correct components required for the selected carrier style.
Optional Solid Pinion Spacer Upgrade
Upgrade your rebuild with a Solid Pinion Spacer (Crush Sleeve Eliminator) for increased reliability under demanding driving conditions.
Unlike a factory crush sleeve that permanently compresses during installation, a solid spacer uses precision shims to establish a fixed pinion bearing preload that remains consistent over time.
Benefits
- Maintains consistent pinion bearing preload
- Eliminates additional crush under heavy loads
- Reduces pinion shaft movement
- Helps prevent gear noise
- Minimizes premature bearing wear
- Precision shim adjustment for accurate setup
- Recommended for oversized tires, rock crawling, overlanding, towing, and high-torque applications
Ideal for vehicles running 35-inch or larger tires or those subjected to severe off-road use.
Vehicle Fitment
This overhaul kit fits Toyota 8-inch rear differentials found in the following factory 4-cylinder applications.
Toyota Pickup
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1979–1983 1st Gen Toyota Pickup
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20R & 22R models
-
Toyota 8-inch rear differential
-
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1984–1985 2nd Gen Toyota Pickup
-
22R & 22RE models
-
Toyota 8-inch rear differential
-
Toyota 4Runner
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1984–1985 1st Gen Toyota 4Runner
-
22R & 22RE models
-
Toyota 8-inch rear differential
-
Important Fitment Information
Toyota axle assemblies are sometimes swapped between vehicles during repairs and off-road builds.
Always purchase your overhaul kit based on the year and design of the differential housing—not the vehicle model year.
Why Choose Yukon Gear & Axle?
Yukon Gear & Axle designs every Master Differential Overhaul Kit specifically for its intended differential application rather than using universal components. Combined with premium Timken® bearings, precision-machined installation parts, and complete hardware, these kits provide the quality and reliability required for factory restorations, daily-driven trucks, and serious off-road builds.