InMotion WS6818 Differential Pinion Seal - Front Outer or Rear Outer

Differential Pinion Seal for Classic GM Applications

The InMotion WS6818 differential pinion seal is built with nitrile material and precise dimensions to help maintain a secure seal at the pinion area. It is designed to keep contaminants out and help reduce fluid loss in rear differential service on select Chevrolet, GMC, and Pontiac vehicles.

• Nitrile construction for sealing performance in driveline service
• Inside diameter: 1.739 in. and shaft diameter: 1.739 in.
• Outside diameter: 3.008 in. with 3.000 in. housing bore
• Thickness: 0.5 in. for proper seal depth
• Rear outer differential pinion seal application

Fitment and Application Details

Compatible with classic rear differential service on select vehicles, including Fits 1955-1964 Chevrolet Bel Air, Rear Outer, with 8.125in Ring Gear; Fits 1959-1960 Chevrolet El Camino, Rear Outer, with 8.125in Ring Gear; Fits 1964 Chevrolet El Camino, Rear Outer, with 8.125in Ring Gear; Fits 1958-1964 Chevrolet Impala, Rear Outer, with 8.125in Ring Gear; Fits 1956-1962 Chevrolet Corvette, Rear Outer; Fits 1963 GMC G1000 Series, Rear Outer, 3.00in Outside Diameter; and Fits 1955-1958 Pontiac Laurentian, Rear Outer, with 8.125in Ring Gear. The InMotion WS6818 is a direct-fit sealing component for rear outer pinion service on these applications.

This part cross-references no listed interchange part numbers in the provided data.

What This Seal Helps Address

• Gear oil seepage at the differential pinion area
• Contamination from dirt, moisture, and road debris
• Wear-related sealing loss during differential service
• Leak concerns after pinion seal replacement
• Maintenance on rear outer differential assemblies in classic GM drivetrains

Installation Notes and Quality

Verify shaft diameter, housing bore, and ring gear application before installation. Clean the sealing surface thoroughly and inspect the pinion area for wear or damage that could affect seal performance. The nitrile material and dimensional specifications support accurate fitment for the listed Chevrolet, GMC, and Pontiac applications.

InMotion WS6818 is engineered for differential sealing service using the dimensions and material listed above.