National 710688 Axle Output Shaft Seal - Front Right

Axle Output Shaft Seal for Front Right Applications

The National 710688 axle output shaft seal is built for front right driveline service where a precise seal is needed to retain lubricant and help keep contaminants out. It is a nitrile oil seal with a bi-directional lip design, sized for a 1.476 in. shaft and a 2.961 in. outside diameter.

Compatible with select Chevrolet Trailblazer, GMC Envoy, Saab 9-7x, Isuzu Ascender, Buick Rainier, Trailblazer EXT, Envoy XL, and Envoy XUV front right applications, this seal is sized for vehicles using a 7.25 in. ring gear, AAM differential, and independent front suspension. National 710688 is also cross-referenced to SKF 12400 for the same application.

Key Features

• Part number: National 710688
• Part type: axle output shaft seal / oil seal
• Material: nitrile
• Bi-directional lip design for sealing in either rotational direction
• Inside diameter: 1.476 in. (31.750 mm)
• Outside diameter: 2.961 in. (75.200 mm)
• Width: 0.571 in. (14.500 mm)
• Housing bore: 2.953 in. (75.000 mm)
• Overall width with side lip: 0.787 in. (20.000 mm)

Detailed Description

National 710688 is an axle output shaft seal engineered for driveline sealing at the front right position. Its nitrile construction and bi-directional lip design support consistent sealing performance around the shaft, while the listed dimensions help confirm proper housing and shaft fitment before installation. This seal is specified for 2002-2009 Chevrolet Trailblazer, 2002-2009 GMC Envoy, 2005-2009 Saab 9-7x, 2003-2008 Isuzu Ascender, 2004-2007 Buick Rainier, 2002-2006 Chevrolet Trailblazer EXT, 2002-2006 GMC Envoy XL, and 2004-2005 GMC Envoy XUV front right applications with the noted differential configuration.

National has supplied sealing solutions for more than 75 years, and this part reflects that focus on dimensional accuracy and modern vehicle requirements. If you are replacing a leaking axle output shaft seal on a Chevrolet Trailblazer or GMC Envoy, National 710688 provides the specified OE-style sealing dimensions for the listed applications.

What This Seal Helps Address

• Gear oil seepage at the front right axle output shaft
• Contamination entering the differential area through a worn seal
• Fluid loss caused by hardened or damaged sealing lips
• Noise or driveline concerns related to low lubricant level
• Service replacement for a leaking axle output shaft seal on the listed vehicles

Installation Notes and Tips

Verify shaft diameter, housing bore, and width against the removed seal before installation. Clean the bore and shaft sealing surface thoroughly, and inspect for grooves, corrosion, or damage that could affect sealing. Confirm the vehicle uses the 7.25 in. ring gear, AAM differential, and independent front suspension noted in the fitment data for Chevrolet Trailblazer, GMC Envoy, and related applications.

Quality Assurance

National is a long-established sealing brand with a history of supplying premium sealing solutions for automotive service. Part number 710688 is manufactured to the listed dimensions and application requirements for the specified front right driveline fitments.