National 4530 Manual Transmission Output Shaft Seal

Manual Transmission Output Shaft Seal for GM Applications

National 4530 is a manual transmission output shaft seal built for specific Chevrolet and GMC applications using the New Process 3500 transmission. It is designed with a polyacrylate sealing material and a counter-clockwise spiral lip design to help maintain a consistent seal at the output shaft.

Use this seal when servicing a Chevrolet S10, Blazer, C1500, C2500, C3500, S10 Blazer, or a GMC C1500, C2500, C3500, Jimmy, Sonoma, or S15 Jimmy equipped with the specified transmission and casting number. National 4530 is also referenced by part number 4530 for direct replacement searches.

Key Features

• Manual transmission output shaft seal for transmission sealing service
• Polyacrylate material for durable sealing performance
• Counter-clockwise spiral lip design
• Redi-Coat treated surface for installation support
• Inside diameter: 1.502 in. / 38.150 mm
• Outside diameter: 2.132 in. / 54.150 mm
• Width: 0.492 in. / 12.500 mm
• Housing bore: 2.126 in. / 54.000 mm

Product Details

National has supplied sealing solutions for more than 75 years, and this oil seal reflects that focus on transmission service parts. The 4530 is a Series 4000, Type 96 seal with a 1.502-inch shaft diameter and 2.132-inch outside diameter, sized for the listed New Process 3500 transmission applications. If you are searching by interchange, this part cross-references SKF 14712 for the same application.

What It Helps Fix

• Transmission fluid leakage at the output shaft
• Seepage around the rear of the manual transmission
• Seal wear from age, heat, and mileage
• Fluid loss that can leave the transmission low on lubricant
• Service issues on GM trucks and SUVs with the specified transmission

Installation Notes and Tips

• Verify the transmission casting number CC20844 before ordering.
• Confirm the vehicle uses the New Process 3500 transmission.
• Inspect the shaft surface and housing bore for wear or scoring before installation.
• Clean the sealing area thoroughly so the lip seats evenly.
• Match the seal dimensions to the original part before installation.

Quality Assurance

National builds sealing products with long-running industry experience and ongoing design updates for modern vehicle service needs. Part number 4530 is engineered to meet the dimensional and application requirements listed for the specified Chevrolet and GMC manual transmission fitments.

• Fits 1991-1998 Chevrolet S10, N/A, with New Process 3500 Transmission
• Fits 1995 Chevrolet Blazer, N/A, with New Process 3500 Transmission
• Fits 1991-1995 Chevrolet C1500, N/A, with New Process 3500 Transmission
• Fits 1991-1995 Chevrolet C2500, N/A, with New Process 3500 Transmission
• Fits 1991-1995 GMC C1500, N/A, with New Process 3500 Transmission
• Fits 1991-1995 GMC C2500, N/A, with New Process 3500 Transmission
• Fits 1992-1995 GMC Jimmy, N/A, with New Process 3500 Transmission
• Fits 1991-1995 GMC Sonoma, N/A, with New Process 3500 Transmission
• Fits 1991-1994 Chevrolet S10 Blazer, N/A, with New Process 3500 Transmission
• Fits 1992-1993 Chevrolet C3500, N/A, with New Process 3500 Transmission
• Fits 1991-1993 GMC C3500, N/A, with New Process 3500 Transmission
• Fits 1991 GMC S15 Jimmy, N/A, with New Process 3500 Transmission