National 8160S Manual Transmission Output Shaft Seal

National 8160S Manual Transmission Output Shaft Seal

The National 8160S is a manual transmission output shaft seal built for applications that need a precise sealing surface and stable fit. It uses nitrile sealing material and measures 1.562 in. inside diameter, 2.457 in. outside diameter, and 0.500 in. width for a direct replacement-style service part.

National has supplied sealing solutions for more than 75 years, and this oil seal reflects that focus on dimensional accuracy and modern drivetrain service needs. It is a practical choice for Dodge, Chrysler, and Jeep manual transmission repairs where the output shaft seal must control fluid leakage at the housing bore.

Key Features

• Part number: 8160S
• Manual transmission output shaft seal / oil seal
• Nitrile sealing material for dependable fluid sealing
• Inside diameter: 1.562 in. (39.670 mm)
• Outside diameter: 2.457 in. (62.410 mm)
• Width: 0.500 in. (12.700 mm)
• Housing bore: 2.441 in. (62.000 mm)
• Series: 8000
• Type: 32

Detailed Description

National 8160S is engineered as a manual transmission output shaft seal for service work on older Chrysler, Dodge, and Jeep drivetrains. The nitrile sealing material is selected for oil resistance, while the seal dimensions are sized to match the specified shaft and housing bore requirements. This makes it a strong fit for manual transmission seal replacement on vehicles such as Dodge D150, D250, W150, W250, Ramcharger, and Jeep CJ5 applications listed in the fitment data.

This part cross-references Dorman - HELP 20716 for the same application. National 8160S also appears in interchange listings with other aftermarket part numbers, including Bosch 15620 and Four Seasons 44094.

What It Helps Fix

• Transmission fluid leaking from the output shaft area
• Wet or oily residue around the manual transmission tail housing
• Seal wear from age, heat, and drivetrain use
• Loss of sealing at the housing bore
• Service issues on New Process 435A, 435L, 445, A230, A250, A745, and A833 applications listed in fitment

Installation Notes and Tips

Verify shaft diameter, housing bore, and transmission type before installation. This seal is listed across multiple manual transmission configurations, including 23-spline applications and models noted without boot, so confirm the exact drivetrain setup on the vehicle. Clean the bore and shaft surface thoroughly before installing the seal, and inspect the shaft for grooves or wear that could affect sealing performance.

Fits 1946-1993 Chrysler, Dodge, and Jeep manual transmission applications listed in the fitment data, including Dodge D100, D150, D250, D350, W100, W150, W250, W350, Ramcharger, Aspen, B100, B200, B300, D200, D300, W200, W300, Challenger, Charger, Dart, Monaco, Lancer, and Jeep CJ5 and Wagoneer models.

Quality Assurance

National has built its reputation on premium sealing solutions for more than 75 years and continues to develop sealing products for current and legacy vehicles. The 8160S is part of the National 8000 series and is manufactured to support accurate fitment in manual transmission service.