National 710533 Automatic Transmission Extension Housing Seal - Transmission Extension Housing To Transmission

Automatic Transmission Extension Housing Seal

National 710533 is an automatic transmission extension housing seal built for the transmission extension housing to transmission interface. It uses fluoro-elastomer material and a Redicoat finish to support a precise sealing surface in service. This seal is a direct-fit option for a wide range of Chevrolet, GMC, and Cadillac applications, including Silverado 1500, Sierra 1500, Tahoe, Yukon, CTS, and Camaro models.

Key Features

• Part number 710533 automatic transmission extension housing seal
• Fluoro-elastomer construction for sealing performance in transmission service
• Redicoat finish for improved installation handling
• Inside diameter: 2.063 in. / 52.400 mm
• Outside diameter: 3.007 in. / 76.380 mm
• Housing bore: 3.000 in. / 76.200 mm
• Thickness/width: 0.394 in. / 10.010 mm
• National 710500 series oil seal

Detailed Description

National 710533 is engineered as an oil seal for the automatic transmission extension housing to transmission location. The seal dimensions are specified for accurate housing and shaft fitment, with a 2.063-inch shaft diameter, 3.000-inch housing bore, and 0.394-inch thickness. National has supplied sealing solutions for more than 75 years, and this seal reflects that focus on dimensional accuracy and modern material selection. This part cross-references SKF 20706A for the same application.

Compatible With 2009-2019 Chevrolet Silverado 1500, Transmission Extension Housing To Transmission; 2007-2019 GMC Sierra 1500, Transmission Extension Housing To Transmission; and 2009-2019 Cadillac CTS, Transmission Extension Housing To Transmission. It also serves additional GM applications such as Camaro, Colorado, Corvette, Tahoe, Yukon, and Escalade models listed in the fitment data. If you are searching for a transmission extension housing seal for a Chevrolet Silverado 1500 or GMC Sierra 1500, National 710533 is a direct-reference part to verify against your original seal.

Common Repair Uses

• Transmission fluid seepage at the extension housing
• Leakage at the transmission extension housing to transmission joint
• Seal wear from age, heat, or fluid exposure
• Service replacement during transmission tail housing repair
• Restoration of a proper sealing surface after disassembly

Installation Notes

Confirm shaft diameter, housing bore, and seal thickness before installation. Clean the extension housing and mating surfaces thoroughly, and inspect the shaft for wear or scoring that could affect sealing. Use care during installation to avoid damaging the sealing lip, and verify that the seal seats evenly in the bore. Always match the part to the vehicle’s transmission application and original seal dimensions.

Quality Assurance

National is a long-established sealing brand with a focus on premium sealing solutions and ongoing product development for current vehicle platforms. Part number 710533 is built to the listed dimensions and material specification for transmission service applications.