National 711175 Transfer Case Input Shaft Seal

Transfer Case Input Shaft Seal for Ford Super Duty

National 711175 is a premium transfer case input shaft seal built to retain fluid at the transfer case input shaft and help maintain proper sealing under drivetrain load. It is a direct-fit oil seal for select Ford Super Duty applications, including 2011-2016 Ford F-250 Super Duty and 2011-2016 Ford F-350 Super Duty.

Key Features

• Seal type: seal
• Part description: oil seal
• Grade type: premium
• Built by National, a sealing brand with more than 75 years of industry experience
• Fits 2011-2016 Ford F-250 Super Duty and 2011-2016 Ford F-350 Super Duty
• National 711175 is a direct replacement for the listed transfer case application

Detailed Description

This transfer case input shaft seal is made for drivetrain service where fluid retention and shaft sealing are critical. National 711175 is engineered as a premium oil seal for the transfer case input shaft, helping maintain the seal between rotating components and the transfer case housing. It is a strong match for Ford F-250 Super Duty and Ford F-350 Super Duty trucks in the 2011-2016 model years. This part cross-references SKF 23420A for the same application.

Common Problems It Can Address

• Transfer case fluid seepage at the input shaft
• Oil residue around the transfer case housing
• Seal wear from shaft rotation and heat exposure
• Loss of sealing performance during drivetrain operation
• Service replacement for worn or damaged transfer case seals

Installation Notes and Tips

Inspect the input shaft, sealing surface, and surrounding housing before installation. Clean the bore thoroughly and verify the replacement seal matches the original dimensions and orientation. For best results, install the seal squarely to avoid distortion and check for leaks after reassembly. Fits 2011-2016 Ford F-250 Super Duty and 2011-2016 Ford F-350 Super Duty, N/A.

Quality Assurance

National has supplied sealing solutions for more than 75 years and develops products to meet modern vehicle service requirements. National 711175 is built as a premium replacement oil seal for transfer case repair work.