National 481181N Manual Transmission Input Shaft Seal

Overview of National Manual Transmission Input Shaft Seal 481181N

The National 481181N manual transmission input shaft seal is engineered for reliable sealing performance in Chevrolet and GMC trucks and SUVs. Designed with durable polyacrylate material, this oil seal helps maintain transmission integrity by preventing fluid leaks and contamination.

• Constructed from high-quality polyacrylate for durability and resistance
• Inside diameter of 1.625 inches (41.280 mm) to fit input shafts precisely
• Outside diameter measures 2.129 inches (54.080 mm) for secure housing fit
• Seal thickness of 0.250 inches (6.350 mm) ensures proper sealing depth
• Redicoat surface treatment enhances wear resistance and longevity
• Compatible with a wide range of Chevrolet and GMC models including Blazer, C10, K5 Blazer, and Suburban variants

Detailed Product Description and Specifications

The National 481181N is part of the 480000 series of transmission gaskets and sealing systems, specifically designed as a manual transmission input shaft seal. Its polyacrylate construction offers excellent resistance to heat, oil, and wear, making it suitable for demanding automotive environments. The seal features a precise inside diameter of 1.625 inches (41.280 mm) to fit the input shaft snugly, while the outside diameter of 2.129 inches (54.080 mm) matches the housing bore size of approximately 2.125 inches (53.980 mm). With a thickness of 0.250 inches (6.350 mm), this seal provides a reliable barrier against transmission fluid leaks. The Redicoat treatment further improves the seal’s durability by reducing friction and wear during operation.

Compatible Vehicles and Applications

This manual transmission input shaft seal is compatible with various Chevrolet and GMC trucks and SUVs, including but not limited to:

• Chevrolet Blazer, C10, C20, C30, and Suburban models
• GMC Jimmy, K5 Blazer, K10, K20, K30, and Suburban variants
• Heavy-duty models such as C1500, C2500, C3500, and their Suburban counterparts
• Van models including G10, G20, G30, P10, P20, and P30

Common Issues Addressed by the 481181N Input Shaft Seal

• Prevents transmission fluid leaks that can cause low fluid levels and damage
• Protects the manual transmission input shaft from dirt and contaminants
• Reduces wear on transmission components by maintaining proper lubrication
• Helps avoid costly transmission repairs due to seal failure
• Maintains optimal transmission performance and longevity

Installation Notes and Tips

• Ensure the transmission input shaft and housing bore are clean and free of debris before installation
• Use appropriate tools to press the seal evenly into the housing bore without distortion
• Verify the seal orientation matches manufacturer specifications, with the Redicoat side facing the fluid
• Inspect the shaft for wear or damage prior to installing the new seal
• After installation, check for leaks during initial operation and retighten components as needed

Quality Assurance and Warranty Information

National transmission seals are manufactured to meet industry standards for durability and performance. The 481181N seal undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty terms may vary, National typically offers coverage against manufacturing defects to provide confidence in product reliability.