SKF 21239 Transfer Case Input Shaft Seal

SKF Transfer Case Input Shaft Seal 21239

SKF 21239 is a transfer case input shaft seal built for applications that need reliable fluid retention at the transfer case input. It is designed with a LongLife sealing surface and precise dimensions for a proper shaft and housing interface on supported Ford, Dodge, and Ram trucks.

Compatible with Ford F-250 Super Duty, Ford F-350 Super Duty, Ford Excursion, Dodge Ram 2500, Dodge Ram 3500, and Ram 2500/3500 transfer case applications, this seal helps maintain clean, stable transfer case operation. The SKF 21239 part number is also referenced in OE-style cross applications for service matching.

Key Features

• Transfer case input shaft seal for sealing the input shaft area
• LongLife sealing surface type for durable sealing performance
• Outside diameter: 2.889 in.
• Shaft diameter: 2.125 in.
• Width: 0.401 in.
• SKF engineered seal design using premium materials
• Part number: 21239

Detailed Description

SKF has a long history in seal engineering, and this transfer case input shaft seal reflects that experience with application-specific design and material selection. The 21239 seal is made to match the required shaft and housing dimensions, helping the transfer case retain lubricant while keeping dirt and moisture out of the sealing area. For service work on Ford F-250 Super Duty and F-350 Super Duty models, as well as Dodge Ram 2500 and Ram 3500 transfer case repairs, the SKF 21239 provides a direct-fit sealing solution where the original seal has worn, hardened, or begun leaking.

This part cross-references 25626 and 5086315AA for the same application.

What It Helps Fix

• Transfer case fluid leaks at the input shaft
• Low fluid level caused by seal wear
• Contamination entering the transfer case through a damaged seal
• Noise or drivability concerns related to insufficient transfer case lubrication
• Service failures after a worn OE seal loses sealing tension

Installation Notes and Tips

• Confirm transfer case type before ordering; listed applications include New Process 271 & 273 and N.V.G. configurations.
• Inspect the input shaft surface for grooves, pitting, or wear before installing the new seal.
• Clean the seal bore and shaft area thoroughly so the sealing lip seats correctly.
• Use proper seal installation tools to avoid distorting the sealing lip or housing.
• Verify the replacement matches the shaft diameter and outside diameter specifications before assembly.

Quality Assurance

SKF designs and manufactures seals to high quality standards, using premium materials and application-specific construction to support long service life and safe operation. The 21239 is built to the dimensional and sealing requirements of the listed transfer case applications.