National 710810 Automatic Transmission Extension Housing Seal

Automatic Transmission Extension Housing Seal

National 710810 is an automatic transmission extension housing seal built for a precise seal at the transmission tail housing. It uses a fluoro-elastomer construction and a bi-directional lip design to help maintain sealing performance in demanding drivetrain conditions. This seal is a direct-fit service part for select Chevrolet Corvette applications.

Key Features

• Part number 710810 automatic transmission extension housing seal
• Fluoro-elastomer material for sealing durability
• Bi-directional lip design for sealing in either rotational direction
• Metric dimensions: 33.000 mm shaft diameter, 53.200 mm outside diameter, 7.250 mm width
• Housing bore size: 53.000 mm
• Compatible with Chevrolet Corvette outer and N/A positions, depending on model year

Detailed Description

National 710810 is an oil seal for the transmission extension housing, also listed as series 710800 and type 35. The seal measures 1.299 in. inside diameter, 2.094 in. outside diameter, and 0.285 in. thickness, with a 2.087 in. housing bore. Its metric sizing and fluoro-elastomer construction support a precise fit in the transmission tail section. This part cross-references Remy 12975 for the same application.

Compatible With 2006-2019 Chevrolet Corvette, Outer, and 1997-2005 Chevrolet Corvette, N/A. If you are servicing a Chevrolet Corvette transmission and need a replacement extension housing seal, National 710810 provides the dimensions and sealing profile required for this application.

Common Problems This Seal Can Address

• Transmission fluid leakage at the extension housing
• Seepage around the output shaft area
• Seal wear from heat and drivetrain movement
• Loss of sealing integrity during transmission service
• Replacement needs during Corvette transmission maintenance

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal width before installation. Clean the housing bore and shaft surface thoroughly, and inspect for scoring or wear that could affect sealing. Confirm the application position before ordering, since this part is listed for Corvette outer and N/A positions across the covered years. Use proper seal installation tools to avoid damaging the lip or case surface.

Quality Assurance

National has supplied sealing products for more than 75 years and develops sealing solutions for modern vehicle applications. Part number 710810 reflects that engineering focus with a metric, OE-style sealing design for transmission service.