Dana Spicer 50491 Drive Axle Shaft Seal - Front or Front Outer

OE-Style Front Outer Axle Shaft Seal

The Dana Spicer FSGR 50491 is a rubber drive axle shaft seal for front outer applications on select Ford trucks and SUVs with Dana 50 or Dana 60 axles. It is built to the same standards as original equipment because Spicer supplies OE parts, making it a direct replacement choice for axle sealing service.

Use this seal when servicing a Ford F-250 Super Duty, F-350 Super Duty, F-350, F-250, or Excursion front axle and you need a precise seal for the axle shaft area. Part number 50491 is also referenced as DS50491.

Key Features

• Brand: Dana Spicer
• Brand line: FSGR
• Part number: 50491
• Drive axle shaft seal for front outer applications
• Rubber construction
• Inside diameter: 2.880 in
• For Dana 50 and Dana 60 axle models
• OE-style replacement built to original equipment standards

Product Details

Spicer light vehicle axle components are manufactured to the same standards used for original equipment, so this seal is a direct-fit replacement for the factory axle seal on the listed Ford applications. The FSGR line focuses on sealing components for driveline and axle service, and this seal is specified for front outer positions with a 4.464 in outside diameter requirement. If you are replacing a worn or leaking axle seal on a Ford Super Duty front axle, 50491 provides the correct sealing profile for the listed Dana axle setups.

Compatible With Ford F-250 Super Duty, Ford F-350 Super Duty, Ford F-350, Ford F-250, and Ford Excursion front axle service where the OE seal specification matches the listed Dana 50 or Dana 60 configuration.

This part cross-references DS50491 for the same application.

What It Helps Fix

• Front axle gear oil seepage at the axle shaft seal area
• Contamination entering the axle housing through a worn seal
• Seal wear from age, heat, and road exposure
• Loss of proper sealing on Dana 50 or Dana 60 front axle assemblies
• Service issues caused by an incorrect OE replacement seal size

Installation Notes

Verify axle model, position, and OE part number before installation. This seal is listed for front outer applications on Dana 60 setups and front applications on Dana 50 setups, so confirm the vehicle’s axle configuration before ordering. Clean the sealing surface thoroughly and inspect the axle shaft and hub area for wear or damage that could affect seal performance.

Quality Assurance

Genuine Spicer axle parts are produced to OE standards, and Dana continues to refine its axle and sealing technology for replacement service. Part number 50491 is a Spicer replacement seal for the listed Ford applications and axle configurations.