Timken 481181N Manual Transmission Input Shaft Seal

Timken Manual Transmission Input Shaft Seal

Restore sealing performance in classic GM manual transmissions with the Timken 481181N input shaft seal. This manual transmission input shaft seal is built for select Chevrolet and GMC trucks and SUVs, including Muncie M20 and 1st design applications.

Key Features

• Precision sealing design helps keep lubricant inside the transmission and contaminants out
• Reinforced outer case helps resist installation damage and adds durability
• Ribbed rubber inner diameter helps seal minor spindle imperfections and improve seating
• Internal contamination exclusion system helps block debris that can lead to leakage
• Vent holes promote lubricant flow around the seal lip to reduce heat buildup

Detailed Description

Timken 481181N is a manual transmission input shaft seal for select Chevrolet Blazer, C/K truck, Suburban, and GMC truck and SUV applications. It is listed for Muncie M20 and 1st design transmissions on many fitments, making it a direct replacement choice for owners servicing older GM manual gearboxes. The seal is engineered to maintain a tight barrier at the input shaft, helping preserve transmission fluid level and protect internal components from dirt and road debris.

This part cross-references National 481181N for the same application.

What It Helps Fix

• Transmission fluid seepage at the input shaft
• Contamination entering the bellhousing or transmission case
• Heat-related seal wear from poor lubricant circulation
• Leakage caused by minor shaft surface imperfections
• Seal damage during installation on older manual transmissions

Installation Notes and Tips

Verify transmission type before ordering, especially on Chevrolet and GMC vehicles with Muncie M20 or 1st design manual transmissions. Inspect the input shaft surface for wear, scoring, or corrosion before installing the new seal. Clean the bore thoroughly and seat the seal evenly to avoid distortion. Confirm the application against the vehicle and transmission code for your specific Chevrolet Blazer, C/K truck, or GMC model.

Quality Assurance

Timken oil and grease seals are built with precision sealing features and durable construction intended for dependable service in drivetrain applications.

• Fits 1988 Chevrolet Blazer, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 Chevrolet C1500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 Chevrolet C2500, manual transmission input shaft seal.
• Fits 1988 Chevrolet C3500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 Chevrolet K1500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 Chevrolet K2500, manual transmission input shaft seal.
• Fits 1988 Chevrolet K3500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 Chevrolet R20, manual transmission input shaft seal.
• Fits 1988 Chevrolet R30, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 Chevrolet V30, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 GMC C1500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1980-1981 GMC C1500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 GMC C2500, manual transmission input shaft seal.
• Fits 1979-1981 GMC C2500, manual transmission input shaft seal.
• Fits 1988 GMC C3500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1979-1981 GMC C3500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 GMC Jimmy, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1980-1981 GMC Jimmy, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 GMC K1500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1980-1981 GMC K1500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 GMC K2500, manual transmission input shaft seal.
• Fits 1979-1981 GMC K2500, manual transmission input shaft seal.
• Fits 1988 GMC K3500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1979-1981 GMC K3500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 GMC R2500, manual transmission input shaft seal.
• Fits 1988 GMC R3500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1988 GMC V3500, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1980-1981 Chevrolet C10, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1980-1981 Chevrolet C10 Suburban, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1975-1981 Chevrolet C20, manual transmission input shaft seal.
• Fits 1968-1981 Chevrolet C20 Suburban, manual transmission input shaft seal.
• Fits 1978-1981 Chevrolet C30, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1980-1981 Chevrolet K10, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1980-1981 Chevrolet K10 Suburban, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1975-1981 Chevrolet K20, manual transmission input shaft seal.
• Fits 1968-1981 Chevrolet K20 Suburban, manual transmission input shaft seal.
• Fits 1978-1981 Chevrolet K30, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1980-1981 Chevrolet K5 Blazer, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1980-1981 GMC C1500 Suburban, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1979-1981 GMC C2500 Suburban, manual transmission input shaft seal.
• Fits 1980-1981 GMC K1500 Suburban, manual transmission input shaft seal - Fits Muncie M20 and 1st Design transmissions.
• Fits 1979-1981 GMC K2500 Suburban, manual transmission input shaft seal.
• Fits 1975-1977 Chevrolet C10, manual transmission input shaft seal.
• Fits 1968-1977 Chevrolet C10 Suburban, manual transmission input shaft seal.
• Fits 1975-1977 Chevrolet C30, manual transmission input shaft seal.
• Fits 1975-1977 Chevrolet K10, manual transmission input shaft seal.
• Fits 1968-1977 Chevrolet K10 Suburban, manual transmission input shaft seal.
• Fits 1977 Chevrolet K30, manual transmission input shaft seal.
• Fits 1975-1977 Chevrolet K5 Blazer, manual transmission input shaft seal.
• Fits 1970-1977 GMC Jimmy, manual transmission input shaft seal.
• Fits 1969-1974 Chevrolet Blazer, manual transmission input shaft seal.