Sumo Gear RF1A Transfer Case Rebuild Kit (1985-95 4Runner / 1979-95 Pickup)

Sumo Gear RF1A Transfer Case Rebuild Kit

For 1985–1995 Toyota 4Runner / 1979–1995 Toyota Pickup 4WD with RF1A gear-driven transfer case

Overview

The Sumo Gear RF1A Transfer Case Rebuild Kit provides the core bearings, seals, and gaskets needed to overhaul one Toyota RF1A gear-driven transfer case. Choose the Main Rebuild Kit for the standard rebuild package, or add the Major Needle Bearing Kit for a more comprehensive internal bearing service while the transfer case is disassembled.

Both configurations use Japanese-made drivetrain service components selected for proper fitment, quiet operation, and long-term service in classic Toyota 4WD applications.

Key Features

• RF1A-specific rebuild package for one gear-driven transfer case
• Main kit includes roller bearings, gaskets, and seals
• Optional Major Needle Bearing Kit adds internal needle and pocket bearings
• Uses Japanese-made bearings, seals, and gasket components
• Designed for classic Toyota 4WD manual-transmission RF1A applications
• Available as a standard rebuild configuration or a more comprehensive major rebuild configuration

RF1A Rebuild Coverage

The Main Rebuild Kit covers the primary roller bearings, seals, and gaskets typically replaced during RF1A service. The Main Rebuild Kit + Major Needle Bearing Kit adds the internal needle and pocket bearings, making it the better choice when the transfer case is being fully disassembled and you want to replace the additional internal bearing components at the same time.

This kit does not change the factory transfer-case ratio. Customers rebuilding an RF1A while also installing deeper low-range gearing can pair it with the Sumo Gear 4.7:1 RF1A Transfer Case Gear Set.

Vehicle Fitment

• 1985–1989 Toyota 4Runner – 1st Gen – 4WD – 4-Cylinder – RF1A Gear-Driven Transfer Case
• 1990–1995 Toyota 4Runner – 2nd Gen – 4WD – 4-Cylinder – RF1A Gear-Driven Transfer Case
• 1979–1983 Toyota Pickup – 1st Gen – 4WD – 4-Cylinder – RF1A Gear-Driven Transfer Case
• 1984–1988 Toyota Pickup – 2nd Gen – 4WD – 4-Cylinder – RF1A Gear-Driven Transfer Case
• 1989–1995 Toyota Pickup – 3rd Gen – 4WD – 4-Cylinder – RF1A Gear-Driven Transfer Case

Fitment Notes

• RF1A gear-driven transfer cases only.
• 4WD applications only.
• Manual-transmission applications only.
• Factory 3VZ-E V6 trucks use a chain-driven transfer case and are not direct RF1A applications.
• Modified, swapped, and dual-case vehicles should be matched to the transfer case actually installed.
• Transfer-case disassembly and bearing replacement require appropriate drivetrain-service tools and experience.

If you are unsure which transfer case is installed, use the Toyota RF1A Transfer Case Identification Guide before ordering.

Product Specifications

Brand: Sumo Gear
Product Type: Transfer Case Rebuild Kit
Transfer Case: Toyota RF1A Gear-Driven
Position: Transfer Case / Drivetrain
Drivetrain: 4WD
Transmission: Manual
Service Coverage: One RF1A transfer case
Manufacturing: Japan

Related RF1A Parts & Identification

For transfer-case identification, spline and shifter information, see the RF1A Transfer Case Identification Guide. If the rebuild is being combined with a lower-range upgrade, see the Sumo Gear 4.7:1 RF1A Transfer Case Gear Set.

Available Configurations

• Main Rebuild Kit — roller bearings, gaskets, and seals for the standard RF1A rebuild.
• Main Rebuild Kit + Major Needle Bearing Kit — includes everything in the Main Rebuild Kit plus the internal needle and pocket bearings for a more comprehensive overhaul.