Dana Spicer 40773 Axle Intermediate Shaft Seal - Front Right Inner

OE-Style Axle Seal for Dana 50 Applications

The Dana Spicer FSGR 40773 axle intermediate shaft seal is a rubber seal built for front right inner axle service on select Ford, Mazda, and Mercury vehicles. It is made to the same standards used for original equipment axle sealing, giving you a direct replacement for worn or leaking axle seals.

Use this seal when servicing Dana 50 and related front axle setups on applications such as Ford F-250 and Ford F-350 models. The 40773 seal is also listed for several Dana 35 and Dana 44 reverse-rotation front axle applications, making fitment verification important before ordering.

Key Features

• Brand: Dana Spicer
• Part number: 40773
• Axle model: Dana 50
• Material: Rubber
• Inside diameter: 1.400 in.
• Front right inner axle seal application
• OE-style replacement for select Ford, Mazda, and Mercury vehicles

Detailed Product Information

Spicer FSGR axle products are built as genuine OE replacement parts, so the seal follows the same performance and reliability expectations used in factory axle assemblies. This axle intermediate shaft seal is used in driveline and axle sealing systems where maintaining lubricant retention and keeping contaminants out of the axle housing are critical. The 40773 seal is a practical choice for front axle service on Ford F-250, Ford F-350, Ford Bronco, Ford F-150, Ford Explorer, Ford Ranger, Mazda B3000, Mazda B4000, and Mercury Mountaineer applications listed in the fitment data.

This part cross-references DS40773 for the same application.

What This Seal Helps Address

• Front axle fluid seepage at the intermediate shaft area
• Contamination entering the axle housing through a worn seal
• Noise or wear related to low axle lubricant level
• Service replacement for aging or damaged OE axle seals
• Leak repair on Dana 50, Dana 35, Dana 44 reverse-rotation front axle setups

Installation Notes and Tips

Confirm axle model, side, and position before installation. This seal is listed for the front right inner position, with notes that vary by vehicle and axle configuration, including Dana 50 IFS, Dana 35 with reverse rotation, and Dana 44 with reverse rotation. Inspect the shaft surface and seal bore for wear, scoring, or debris before installing the new seal. Clean the sealing area thoroughly and verify the replacement matches the original OE part number reference E3TZ-3254-C where applicable.

Quality Assurance

Dana Spicer states that its genuine light vehicle axle products are manufactured to OE standards because they are OE parts. That OE-based manufacturing approach supports consistent fit and sealing performance for the 40773 axle intermediate shaft seal.