InMotion WS100357 Wheel Seal - Rear

Rear Differential Pinion Seal for Ford F-150

The InMotion WS100357 is a rear differential pinion seal built with fluoro-elastomer material for dependable sealing at the pinion shaft. It helps keep contaminants out of the differential while maintaining a tight barrier against gear oil leaks in Ford F-150, Expedition, Navigator, and related rear axle applications.

• Fluoro-elastomer construction for sealing performance in driveline service
• Inside diameter: 1.705 in; shaft diameter: 1.705 in
• Outside diameter: 3.039 in; housing bore: 3.034 in
• Width: 0.562 in for a precise fit in the housing
• Rear axle application for select Ford and Lincoln vehicles
• Part number: WS100357

Fitment Details

• Fits 2017-2019 Ford F-150, rear.
• Fits 1998-2016 Ford F-150, rear, with 9.75in Ring Gear.
• Fits 2006-2008 Lincoln Mark LT, rear.
• Fits 2004 Ford F-150 Heritage, rear, with 9.75in Ring Gear.
• Fits 1997-2002 Ford Expedition, rear.
• Fits 2002 Lincoln Blackwood, rear.
• Fits 1998-2002 Lincoln Navigator, rear.

How This Seal Works

This differential pinion seal is used at the rear pinion area to retain lubricant and block road debris, water, and moisture from entering the differential assembly. On applications such as the Ford F-150 rear axle and Lincoln rear driveline setups, a worn seal can lead to gear oil seepage, contamination, and accelerated wear inside the differential. WS100357 addresses that sealing point with a precise housing and shaft interface.

Common Problems It Can Address

• Rear differential gear oil leaking from the pinion area
• Contamination entering the differential through a worn seal
• Moisture intrusion around the pinion shaft
• Noise or wear caused by low lubricant level
• Service replacement for deteriorated rear axle sealing surfaces

Installation Notes

Verify axle configuration before ordering, especially on 1998-2016 Ford F-150 and 2004 Ford F-150 Heritage models that require the 9.75in ring gear application. Inspect the pinion yoke, sealing surface, and housing bore for wear or scoring before installation. Clean the bore thoroughly and confirm the seal seats squarely to maintain proper sealing at the rear differential.

Quality Assurance

InMotion manufactures this seal with precision-focused dimensions and fluoro-elastomer material selection to support reliable driveline sealing in rear differential service. Part number WS100357 is specified for select Ford and Lincoln rear axle applications, including Ford F-150 and Expedition platforms.