Timken 710389 Transfer Case Input Shaft Seal

Transfer Case Input Shaft Seal for Ford Applications

Timken 710389 is a transfer case input shaft seal built to retain lubricant and block contaminants at the transfer case input shaft. It is a direct-fit sealing component for select Ford trucks and SUVs with the Spicer TC28 transfer case, including Ranger, Explorer, Aerostar, and Bronco II applications.

Key Features

• Precision sealing design helps control oil and grease at the transfer case input shaft
• Reinforced outer case resists installation damage and supports seal durability
• Ribbed rubber inner diameter seals minor spindle imperfections and promotes positive seating
• Internal contamination exclusion system helps keep debris out of the sealing area
• Vent holes allow lubricant flow around the seal lip to reduce heat buildup
• Timken part number 710389 for service matching and catalog lookup

Detailed Description

Timken 710389 is a transfer case input shaft seal engineered for vehicles using the Spicer TC28 transfer case. It is used on 1990 Ford Bronco II, 1990-1997 Ford Aerostar, 1991-1997 Ford Explorer, and 1990-1997 Ford Ranger. The seal’s reinforced case, ribbed inner diameter, and contamination-exclusion features are designed to maintain a stable seal at the input shaft while supporting consistent lubricant retention. Timken 710389 is a practical replacement for service work on Ford transfer case sealing systems where leakage or contamination is a concern.

Common Issues This Seal Addresses

• Transfer case fluid seepage at the input shaft
• Contamination entering the sealing area
• Seal wear from heat buildup around the lip
• Leakage caused by minor shaft surface imperfections
• Reduced sealing performance during transfer case service

Installation Notes and Tips

Confirm the vehicle uses the Spicer TC28 transfer case before ordering. Inspect the input shaft surface for scoring, pitting, or contamination before installation, and clean the sealing bore thoroughly. Proper seal alignment during installation is important to avoid case damage and to maintain an even sealing surface. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Quality Assurance

Timken oil and grease seals are built with precision sealing geometry and contamination-control features for drivetrain service applications. Part number 710389 is intended for repair use on the listed Ford fitments and transfer case configuration.