InMotion WS8594S Wheel Seal - Rear

Rear Differential Pinion Seal for Classic GM Applications

The InMotion WS8594S is a rear seal built with nitrile material to help keep differential pinion components protected from road debris, moisture, and fluid loss. It is sized for a precise fit, with a 1.35 inside diameter, 2.575 outside diameter, and 0.70599999999999996 width for the listed rear applications.

Key Features

• Nitrile construction for sealing performance in driveline service
• 1.35 inside diameter and 1.35 shaft diameter
• 2.575 outside diameter and 2.571 housing bore
• 0.70599999999999996 width for the specified differential seal application
• Rear position fitment for select Oldsmobile, Pontiac, and Buick models
• Part number WS8594S for easy identification

Detailed Description

Built for rear differential service, the InMotion WS8594S helps maintain a secure barrier at the pinion area where contamination and lubricant leakage can affect driveline operation. Its nitrile sealing material is selected for use in sealing systems where consistent contact and dimensional accuracy matter. This part number WS8594S is listed for classic rear applications including 1964-1969 Pontiac GTO, 1964-1969 Pontiac LeMans, 1964-1969 Pontiac Tempest, 1967-1969 Pontiac Firebird, 1969 Pontiac Grand Prix, 1964-1969 Oldsmobile Cutlass, 1967-1969 Oldsmobile Cutlass Supreme, 1964-1968 Buick Skylark, and 1965 Buick LeSabre. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Problems This Seal Helps Address

• Differential oil seepage at the pinion area
• Contamination from dirt, water, and road debris
• Wear caused by degraded or hardened sealing material
• Loss of lubricant that can affect rear axle operation
• Service issues on classic GM rear driveline assemblies

Installation Notes and Tips

Verify housing bore, shaft diameter, and seal width before installation. Clean the sealing surface and inspect the pinion area for wear, scoring, or contamination that could affect sealing performance. Confirm rear position fitment for your vehicle before ordering. Compatible with select rear applications on Pontiac GTO, Pontiac LeMans, and Oldsmobile Cutlass models listed above.

Quality Assurance

InMotion manufactures this seal with precision-focused dimensions and sealing materials intended for driveline service. The WS8594S is specified for the listed rear applications and built to support reliable sealing in classic differential assemblies.