National 4529N Manual Transmission Input Shaft Seal

Manual Transmission Input Shaft Seal for NP3500

The National 4529N manual transmission input shaft seal is built for manual gearbox service where shaft sealing and fluid retention matter. It uses a polyacrylate sealing material with a clockwise-spiral lip design and Redi-Coat surface treatment for consistent sealing performance in the transmission case.

Compatible With Chevrolet Silverado 1500, GMC Sierra 1500, Dodge Ram 1500, Jeep Wrangler, and other manual-transmission applications listed below, this seal is sized for a 1.375-inch shaft and a 2.052-inch outside diameter. The National 4529N is part of the 4000 series and is identified as a Type 68 oil seal.

Key Features

• Part number 4529N manual transmission input shaft seal
• Polyacrylate construction for sealing durability
• Clockwise-spiral lip design for transmission input shaft service
• Redi-Coat treated sealing surface
• 1.375 in. shaft diameter, 2.052 in. outside diameter, 0.330 in. width
• Series 4000, Type 68 oil seal

Product Details

National has supplied sealing solutions for more than 75 years, and the 4529N reflects that focus on transmission sealing components. This seal is specified for manual transmission input shaft applications, including New Process 3500 and New Process 3550 transmissions in the listed vehicles. The design and dimensions help match the shaft and housing bore requirements for a proper seal interface. This part cross-references BBB Industries 13888 for the same application.

Common Problems This Seal Helps Address

• Transmission fluid leakage at the input shaft area
• Contamination entering the manual transmission through a worn seal
• Oil seepage around the bellhousing interface
• Seal wear from age, heat, and shaft rotation
• Service replacement for damaged or hardened original seals

Installation Notes and Fitment

• Fits 2007 Chevrolet Silverado 1500 Classic, manual transmission input shaft seal for New Process 3500 transmission
• Fits 2007 GMC Sierra 1500 Classic, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1999-2006 Chevrolet Silverado 1500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1999-2006 GMC Sierra 1500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-2005 Chevrolet Blazer, manual transmission input shaft seal for New Process 3500 transmission
• Fits 2005 GMC Jimmy, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-2001 GMC Jimmy, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1994-2004 Dodge Dakota, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1994-2004 Dodge Ram 1500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 2002-2004 Jeep Liberty, with New Process 3550 transmission
• Fits 2000-2004 Jeep Wrangler, with New Process 3550 transmission
• Fits 2003-2004 Jeep Wrangler, with New Process 1500 transmission
• Fits 1991-2003 Chevrolet S10, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-2003 GMC Sonoma, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-2000 GMC C2500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1997-2000 Isuzu Hombre, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-1999 Chevrolet C2500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-1999 Chevrolet K2500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-1999 GMC K2500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-1998 Chevrolet C1500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-1998 Chevrolet K1500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-1998 GMC C1500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-1998 GMC K1500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1995-1997 Dodge Ram 2500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-1994 Chevrolet S10 Blazer, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1992-1993 Chevrolet C3500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1992-1993 Chevrolet K3500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-1993 GMC C3500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1991-1993 GMC K3500, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1988-1991 Chevrolet C1500, for vehicles equipped with a manual transmission
• Fits 1988-1991 Chevrolet C2500, for vehicles equipped with a manual transmission
• Fits 1988-1991 Chevrolet K1500, for vehicles equipped with a manual transmission
• Fits 1988-1991 Chevrolet K2500, for vehicles equipped with a manual transmission
• Fits 1988-1991 Chevrolet S10, for vehicles equipped with a manual transmission
• Fits 1988-1991 Chevrolet S10 Blazer, for vehicles equipped with a manual transmission
• Fits 1988-1991 GMC C1500, for vehicles equipped with a manual transmission
• Fits 1988-1991 GMC C2500, for vehicles equipped with a manual transmission
• Fits 1988-1991 GMC C3500, for vehicles equipped with a manual transmission
• Fits 1988-1991 GMC Jimmy, for vehicles equipped with a manual transmission
• Fits 1988-1991 GMC K1500, for vehicles equipped with a manual transmission
• Fits 1988-1991 GMC K2500, for vehicles equipped with a manual transmission
• Fits 1988-1991 GMC K3500, for vehicles equipped with a manual transmission
• Fits 1991 GMC S15 Jimmy, manual transmission input shaft seal for New Process 3500 transmission
• Fits 1988-1991 GMC S15 Jimmy, for vehicles equipped with a manual transmission
• Fits 1991 GMC Sonoma, for vehicles equipped with a manual transmission
• Fits 1988-1990 Chevrolet C3500, for vehicles equipped with a manual transmission
• Fits 1988-1990 Chevrolet K3500, for vehicles equipped with a manual transmission
• Fits 1988-1990 GMC S15, for vehicles equipped with a manual transmission

Before installation, verify shaft diameter, housing bore, and transmission type against the vehicle application. Clean the bore and shaft surface thoroughly, and inspect for wear or scoring that could affect seal life. The clockwise-spiral lip design should be oriented correctly during installation to match the transmission rotation.

Quality Assurance

National is recognized for premium sealing solutions and long-running coverage in the aftermarket. The 4529N is engineered to meet the dimensional and material requirements of manual transmission input shaft sealing applications.