National 3543 Manual Transmission Output Shaft Seal - Front Left, Left, Rear or Right

Overview of National 3543 Manual Transmission Output Shaft Seal

The National 3543 manual transmission output shaft seal is engineered to provide reliable sealing performance for a wide range of vehicles including Buick, Chevrolet, Ford, and Volvo models. Designed with durable silicone material and a bi-directional lip design, this oil seal helps maintain transmission integrity by preventing fluid leaks.

• Inside diameter options: 1.378 inch (35.000 mm)
• Outside diameter: 2.167 inch (55.042 mm)
• Flanged outside diameter: 2.441 inch (62.000 mm)
• Thickness: 0.425 inch (10.795 mm)
• Bi-directional helix lip design for effective sealing
• Constructed from high-quality silicone sealing material
• Redicoat finish for enhanced durability
• Compatible with multiple makes and models including Buick, Cadillac, Chevrolet, Ford, Geo, Isuzu, Mazda, Mercury, Oldsmobile, Pontiac, Saab, Saturn, Suzuki, and Volvo

Technical Details and Specifications

The National 3543 output shaft seal is part of the Series 3000 and is classified as a Type 57 oil seal. It features a bi-directional lip design that provides effective sealing against transmission fluid leaks in both rotational directions. The seal’s silicone material offers resistance to heat and wear, making it suitable for manual transmissions operating under various conditions. The flanged outside diameter of 2.441 inches (62 mm) ensures a secure fit within the housing bore, which measures approximately 2.162 inches (54.915 mm). The overall width with side lip is 0.577 inches (14.656 mm), providing a robust sealing surface.

Compatible Vehicles and Applications

This manual transmission output shaft seal is compatible with a broad range of vehicles, including but not limited to:

• Buick models such as Century, LeSabre, and Regal
• Chevrolet vehicles including Impala, Malibu, and Cruze
• Ford models like Bronco II and Ranger
• Volvo models including S80 and XC90
• Other makes such as Cadillac, Pontiac, Saab, Saturn, and Suzuki

It is designed to replace worn or damaged output shaft seals in manual transmissions, helping to maintain proper fluid retention and transmission performance.

Common Issues Addressed by National 3543 Seal

• Prevents manual transmission fluid leaks around the output shaft
• Reduces contamination ingress that can cause premature wear
• Maintains proper lubrication within the transmission system
• Helps avoid costly transmission repairs due to seal failure
• Improves overall transmission reliability and lifespan

Installation Notes and Tips

When installing the National 3543 output shaft seal, ensure the housing bore is clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the sealing lip. Verify the seal orientation matches the bi-directional lip design for optimal performance. It is recommended to inspect the shaft surface for wear or damage before installation to ensure a proper seal fit.

Quality Assurance and Warranty

National’s 3543 output shaft seal is manufactured to meet industry standards for durability and performance. The silicone sealing material and Redicoat finish contribute to extended service life under normal operating conditions. While specific warranty details may vary, National typically offers coverage against manufacturing defects to ensure customer confidence in the product’s quality.