National 710646 Transfer Case Input Shaft Seal

Transfer Case Input Shaft Seal for GM 4WD

National 710646 is a transfer case input shaft seal built for full-time and part-time 4WD applications that use Magna transfer cases. It is an oil seal with Ethylene-Acrylic sealing material and dimensions sized for a precise housing and shaft interface.

Use this seal when servicing GM transfer case leaks on vehicles such as the Chevrolet Silverado, GMC Sierra, Cadillac Escalade, and related SUVs and HD trucks. National 710646 is engineered around the shaft and bore measurements needed for a proper seal at the transfer case input.

• Part number: 710646
• Oil seal for transfer case input shaft service
• Ethylene-Acrylic sealing material
• Inside diameter: 1.928 in. / 48.971 mm
• Outside diameter: 2.801 in. / 71.133 mm
• Housing bore: 2.795 in. / 70.933 mm
• Width/thickness: 0.456 in. / 11.582 mm
• Series: 710600
• Cross-reference: SKF 18531

Detailed Fitment and Application

National has supplied sealing solutions for more than 75 years, and this seal reflects that focus on dimensional accuracy and modern vehicle coverage. The 710646 transfer case input shaft seal is listed for 2007-2019 GM trucks and SUVs with Magna transfer cases, including 1-speed and 2-speed full-time 4WD and selected part-time 4WD applications. It fits 2019 Cadillac Escalade and Escalade ESV, 2019 Chevrolet Silverado 1500, 2019 Chevrolet Silverado 2500 HD, 2019 Chevrolet Tahoe, 2019 GMC Sierra 1500, 2019 GMC Sierra 2500 HD, 2019 GMC Yukon, and 2019 GMC Yukon XL with the specified Magna transfer case configurations. It also fits earlier Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Suburban, Avalanche, Yukon XL, and Cadillac Escalade variants across the 2007-2018 model years when equipped with the listed transfer cases.

What This Seal Helps Address

• Transfer case fluid seepage at the input shaft
• Oil residue around the transfer case housing
• Seal wear from age, heat, and drivetrain use
• Leak-related fluid loss during 4WD operation
• Service replacement for worn Magna transfer case sealing surfaces

Installation Notes and Tips

Confirm the transfer case model, shaft diameter, and housing bore before installation. This seal is specified for applications with a double lip design, so inspect the shaft surface for grooves or damage before assembly. Clean the bore and sealing surface thoroughly, and verify the seal seats squarely in the housing to maintain proper contact on the input shaft.

Quality Assurance

National is known for sealing products backed by decades of engineering experience and ongoing development for current vehicle platforms. Part number 710646 is built as a precision replacement seal for the listed GM transfer case applications.