ARB Differential Carrier Conversion Bearing | 45mm to 50mm (1979-95 4Runner/Pickup)

ARB Differential Carrier Conversion Bearing | 45mm to 50mm

For 1984–1995 Toyota 4Runner & 1979-1995 Toyota Pickup Equipped with a 20R, 22R,and 22RE Engines and Toyota 8-Inch Differential

Overview

Upgrade your Toyota 8-inch differential with the ARB 45mm to 50mm Differential Carrier Conversion Bearing, engineered specifically for converting early Toyota 8-inch differentials with 45mm carrier bearing journals to accept 50mm carrier journal differentials, including compatible ARB Air Lockers and other V6-style differential carriers.

This premium tapered roller bearing is commonly used when installing an ARB Air Locker or other 50mm carrier into a factory four-cylinder Toyota 8-inch differential originally equipped with 45mm carrier bearings. The conversion allows earlier Toyota differential housings to accept the stronger, later-style carrier while maintaining proper bearing support and differential alignment.

Manufactured to ARB's specifications, these heavy-duty conversion bearings are designed to withstand the demanding radial and axial loads encountered during daily driving, towing, rock crawling, overlanding, and off-road use.

Available individually or as a complete pair, these bearings are an excellent choice for differential rebuilds, gear changes, carrier replacements, and ARB Air Locker installations.

Why Use 45mm to 50mm Conversion Bearings?

Many Toyota 8-inch differentials originally equipped with four-cylinder engines utilize 45mm carrier bearing journals, while later V6 differential carriers and many ARB Air Lockers are manufactured with 50mm carrier journals.

Rather than replacing the entire axle housing, these conversion bearings allow the larger carrier to be installed into the original housing.

This conversion is commonly performed when upgrading to:

• ARB Air Lockers

• V6 Toyota differential carriers

• Aftermarket locking differentials

• Performance differential carriers

• Heavy-duty off-road differential builds

Features

• Genuine ARB differential carrier conversion bearing

• Converts 45mm Toyota carrier journals to accept 50mm carriers

• Premium tapered roller bearing construction

• Precision-ground bearing races

• Hardened steel tapered rollers

• Designed for Toyota 8-inch differentials

• Excellent for ARB Air Locker installations

• Ideal for differential rebuilds and gear changes

• Supports high-load off-road applications

• Available individually or as a pair

Benefits

Replacing worn carrier bearings or installing new conversion bearings during a differential rebuild helps restore proper differential operation while providing the correct support for the carrier assembly.

Benefits include:

• Smooth and quiet differential operation

• Proper carrier support under heavy loads

• Maintains correct carrier alignment

• Helps maintain proper bearing preload

• Supports accurate ring-and-pinion gear setup

• Increased durability for off-road applications

• Recommended during differential rebuilds and locker installations

Premium Tapered Roller Bearing Construction

ARB conversion bearings utilize a tapered roller bearing design capable of supporting both radial and axial loads generated inside the differential.

The precision-ground races and hardened steel rollers are designed for long service life while maintaining consistent bearing preload and smooth carrier rotation.

Construction Highlights

• Precision-ground bearing races

• Hardened steel tapered rollers

• Heavy-duty bearing cage

• High-strength bearing steel

• Manufactured to ARB quality standards

• Designed for demanding off-road use

Designed for 45mm to 50mm Differential Conversions

These conversion bearings are intended for Toyota 8-inch differentials originally equipped with 45mm carrier bearing journals that are being upgraded to a 50mm carrier.

ARB specifically recommends using this 45mm to 50mm carrier bearing when installing a later-model Air Locker into earlier Toyota housings equipped with 45mm carrier bearings.

Because carrier bearing size is determined by the differential carrier—not simply the vehicle year—it is important to verify the carrier journal diameter before ordering.

If your vehicle originally came equipped with a factory 50mm carrier (including most V6-equipped applications and  22R-TE models), these conversion bearings will NOT fit.

Please purchase our standard 50mm ARB Carrier Bearing listing instead. Click here.

Always verify your carrier bearing journal diameter before ordering.

Professional Installation

Carrier bearing installation requires complete differential disassembly and proper differential setup.

Professional installation is strongly recommended.

During installation:

• Replace both carrier bearings together.

• Replace bearing races if worn or damaged.

• Reset carrier bearing preload.

• Verify ring-and-pinion backlash.

• Verify gear tooth contact pattern.

• Torque all fasteners to factory specifications.

• Follow ARB installation procedures when installing an Air Locker.

Two bearings are required for one complete differential rebuild.

Common Applications

Commonly used during:

• ARB Air Locker installations

• Toyota 8-inch differential rebuilds

• Carrier replacements

• Ring-and-pinion gear installations

• Gear ratio changes

• Off-road axle upgrades

• Overland vehicle builds

• Rock crawling differentials

• Heavy-duty Toyota rear axle rebuilds

Vehicle Compatibility

These conversion bearings fit Toyota 8-inch differentials originally equipped with 45mm carrier bearing journals.

Toyota Pickup

• 1979–1983 1st Gen Toyota Pickup
  • 20R & 22R models
    
  • Toyota 8-inch rear differential
• 1984–1988 2nd Gen Toyota Pickup
  • 22R & 22RE models
    
  • Toyota 8-inch rear differential
• 1989–1995 3rd Gen Toyota Pickup
  • 22RE models
    
  • Toyota 8-inch rear differential
    

Toyota 4Runner

• 1984–1989 1st Gen Toyota 4Runner
  • 22R & 22RE models
    
  • Toyota 8-inch rear differential
    
• 1990–1995 2nd Gen Toyota 4Runner
  • 22RE models
    
  • Toyota 8-inch rear differential
    

Fitment Exclusions

These conversion bearings are not intended for:

• Factory 50mm carrier journals

• 3VZ-E V6 differentials

• 22R-TE differentials 

• Toyota 7.5-inch front IFS differentials
  

What's Included

Choose the option that best fits your project:

• Single Bearing – Includes one (1) genuine ARB 45mm to 50mm carrier bearing
• Pair of Bearings – Includes two (2) genuine ARB 45mm to 50mm carrier bearings for one complete differential rebuild