National 4532N Manual Transmission Output Shaft Seal

Manual Transmission Output Shaft Seal Overview

National 4532N is a manual transmission output shaft seal built for applications using New Process 3500 and 3550 transmissions. It uses a polyacrylate sealing element with a counter-clockwise spiral lip design to help maintain a tight seal at the shaft interface.

Use this seal for manual transmission service on Chevrolet, GMC, and Jeep applications where the specified transmission and shaft dimensions match. The 4532N is part of National’s 4000 series and features Redicoat surface treatment for added sealing support during installation and operation.

Key Features

• Polyacrylate construction for sealing performance in transmission service
• Counter-clockwise spiral lip design for controlled sealing contact
• Redicoat finish to support installation and initial sealing
• Series 4000 design from National
• Dimensions: 1.375 in. shaft diameter, 3.549 in. outside diameter, 0.397 in. width

Detailed Description

The National 4532N manual transmission output shaft seal is engineered for direct replacement in a range of Chevrolet, GMC, and Jeep manual transmission applications. It is specified for New Process 3500 and New Process 3550 transmission use, with fitment covering models such as Chevrolet Silverado 1500, GMC Sierra 1500, Chevrolet S10, GMC Sonoma, and Jeep Wrangler. The seal’s polyacrylate material and spiral lip profile are selected to maintain sealing contact at the shaft while the Redicoat coating supports a consistent seal surface. National 4532N is a practical choice when servicing manual transmission leakage concerns on vehicles that require this exact seal size and design. This part cross-references Four Seasons 4532N for the same application.

What It Is Used For

• Stopping gear oil seepage at the transmission output shaft
• Replacing a worn or hardened seal during transmission service
• Addressing fluid loss caused by lip wear or surface damage
• Restoring sealing performance after transmission removal or rebuild

Installation Notes and Tips

Confirm transmission type, shaft diameter, and housing bore before installation. Clean the sealing surface thoroughly and inspect the shaft for wear, grooves, or corrosion that could affect seal life. Verify the application against the listed fitment for Chevrolet Silverado 1500, GMC Sierra 1500, and Jeep Wrangler models before assembly.

Quality Assurance

National has supplied premium sealing solutions for more than 75 years and continues to develop sealing products for modern vehicle service needs.