National 710718 Manual Transmission Output Shaft Seal

National 710718 Manual Transmission Output Shaft Seal

National 710718 is a manual transmission output shaft seal built for applications that need a precise sealing surface and stable performance under transmission fluid exposure. It uses a fluoro-elastomer sealing material and a counter-clockwise spiral lip design to help maintain a consistent seal at the output shaft.

Compatible With long-tail applications such as Ford F-250 Super Duty and F-350 Super Duty with the ZF S6-650 transmission, as well as Chevrolet Silverado 2500 HD, Silverado 3500, GMC Sierra 2500 HD, and Sierra 3500 with the same transmission family. The National 710718 part number is also referenced in several OE and aftermarket cross-reference listings.

Key Features

• Manual transmission output shaft seal for transmission sealing service
• Fluoro-elastomer material for resistance to transmission fluid and heat
• Counter-clockwise spiral lip design for controlled sealing action
• Metric dimensions for accurate housing and shaft fitment
• Inside diameter: 57.000 mm (2.244 in)
• Outside diameter: 73.200 mm (2.882 in)
• Width: 8.000 mm (0.315 in)
• Housing bore: 73.000 mm (2.874 in)

Detailed Description

National 710718 is part of the 710700 series and is engineered as an oil seal for transmission output shaft service. The fluoro-elastomer sealing material is selected for demanding drivetrain environments, while the spiral lip profile supports consistent contact at the shaft interface. With metric sizing and defined housing bore, shaft, and width measurements, this seal is suited to repair work where dimensional accuracy matters. National has supplied sealing solutions for more than 75 years and continues to apply that experience to modern vehicle applications.

This part cross-references Gates 22416 and Timken SL260126 for the same application. National 710718 is also listed across multiple OE-style reference numbers used in BMW, Jaguar, Aston Martin, Rolls-Royce, Bentley, Ford, Chevrolet, and GMC transmission service applications.

Common Problems This Seal Can Address

• Transmission fluid leakage at the output shaft
• Oil seepage around the seal housing bore
• Seal wear from heat and fluid exposure
• Loss of sealing contact caused by age or hardening
• Service issues on manual transmission output shaft assemblies

Installation Notes and Tips

• Verify shaft diameter, housing bore, and seal width before installation.
• Inspect the output shaft surface for scoring or wear that could affect sealing.
• Clean the bore and surrounding area before pressing the seal into place.
• Confirm transmission type and application details, especially on ZF-equipped Ford, Chevrolet, and GMC models.
• Use proper installation tools to avoid distorting the seal lip or outer case.

Quality Assurance

National is a long-established sealing brand with a focus on premium sealing solutions for drivetrain and transmission service. The 710718 reflects that product experience with a fluoro-elastomer construction and application-specific dimensions for accurate replacement work.

• Fits 1999-2010 Ford F-250 Super Duty, with ZF S6-650 Transmission
• Fits 1999-2010 Ford F-350 Super Duty, with ZF S6-650 Transmission
• Fits 2001-2006 Chevrolet Silverado 2500 HD, with ZF S6-650 Transmission
• Fits 2001-2006 Chevrolet Silverado 3500, with ZF S6-650 Transmission
• Fits 2001-2006 GMC Sierra 2500 HD, with ZF S6-650 Transmission
• Fits 2001-2006 GMC Sierra 3500, with ZF S6-650 Transmission
• Fits 2000-2004 Aston Martin DB7, with ZF 5HP-30 Transmission
• Fits 2001-2003 Aston Martin Vanquish, with ZF 5HP-30 Transmission
• Fits 1998-2003 BMW 540i, with ZF 5HP-24 Transmission
• Fits 2003 BMW Z8, with ZF 5HP-24 Transmission
• Fits 1999-2002 Rolls-Royce Silver Seraph, with ZF 5HP-30 Transmission
• Fits 1999-2001 Bentley Arnage, with ZF 5HP-30 Transmission
• Fits 1998-2001 BMW 740i, with ZF 5HP-24 Transmission
• Fits 1998-2001 BMW 740iL, with ZF 5HP-24 Transmission
• Fits 1995-2001 BMW 750iL, with ZF 5HP-30 Transmission
• Fits 1997 BMW 540i, with ZF 5HP-30 Transmission
• Fits 1994-1995 BMW 540i, with ZF 5HP-30 Transmission
• Fits 1997 BMW 740i, with ZF 5HP-30 Transmission
• Fits 1993-1995 BMW 740i, with ZF 5HP-30 Transmission
• Fits 1993-1997 BMW 740iL, with ZF 5HP-30 Transmission
• Fits 1996-1997 BMW 840Ci, with ZF 5HP-24 Transmission
• Fits 1995-1997 BMW 850Ci, with ZF 5HP-30 Transmission
• Fits 1995-1997 Jaguar XJR, with ZF 5HP-30 Transmission
• Fits 1997 Jaguar XK8, with ZF 5HP-24 Transmission
• Fits 1994-1995 BMW 840Ci, with ZF 5HP-30 Transmission