National 410085 Manual Transmission Output Shaft Seal

Manual Transmission Output Shaft Seal for GM Applications

National 410085 is a manual transmission output shaft seal built with nitrile material and Redicoat protection for dependable sealing performance. With precise dimensions and broad GM fitment coverage, this oil seal is a practical choice for service work on Chevrolet and GMC trucks, vans, and utility models.

• Nitrile construction for sealing performance in transmission service
• Redicoat finish for improved sealing surface protection
• Inside diameter: 2.000 in. / 50.800 mm
• Outside diameter: 3.001 in. / 76.230 mm
• Thickness/width: 0.500 in. / 12.700 mm
• Housing bore: 2.996 in. / 76.100 mm
• Part description: oil seal
• Series 410000, Type 41

Built for Transmission Sealing Accuracy

National has supplied sealing solutions for more than 75 years, and the 410085 reflects that focus with a dimensionally specific design for transmission service. This manual transmission output shaft seal is listed across a wide range of Chevrolet and GMC vehicles, including Chevrolet Blazer, C1500, K1500, P30, and GMC Jimmy, C2500, K3500, and V3500 applications. It is also referenced for GM CH465 transmission service in select listings. This part cross-references SKF 19970 and Stant 49522 for the same application.

Common Problems This Seal Can Address

• Transmission fluid leakage at the output shaft area
• Oil seepage around the rear of the transmission
• Contamination from worn or hardened sealing lips
• Service replacement during transmission repair or rebuild
• Fitment-specific sealing needs on older Chevrolet and GMC drivetrains

Installation Notes and Tips

Verify shaft diameter, housing bore, and transmission application before installation. Clean the sealing surface thoroughly and inspect the shaft for wear, grooves, or corrosion that could affect seal life. Because fitment spans multiple Chevrolet and GMC models from 1968-1991, confirm the exact transmission configuration before ordering. National 410085 is commonly searched for Chevrolet Blazer and GMC Jimmy manual transmission service, as well as GM truck and van applications.

Quality Assurance

National is a long-established sealing brand with a reputation built over decades of transmission and drivetrain sealing development. The 410085 uses nitrile construction and Redicoat treatment to support consistent sealing performance in service applications.