InMotion WS4148 Wheel Seal - Front Inner

Front Inner Differential Pinion Seal for Ford and Lincoln

InMotion WS4148 is a front inner differential pinion seal built with nitrile material for a secure sealing surface around the pinion area. It helps keep contaminants out and fluid in, supporting reliable differential operation in demanding driving conditions.

Key Features

• Nitrile seal material for durable sealing performance
• Measures 1.95 in. inside diameter, 2.63 in. outside diameter, and 0.280 in. width
• Housing bore: 2.623 in. / 66.6 mm
• Shaft diameter: 2.00 in. / 50.8 mm
• Spring material: SAE 1008
• External markings: 2.00 x 2.623 x 0.26
• Part number: WS4148

Detailed Description

Built for front inner applications, InMotion WS4148 is a differential pinion seal that helps maintain a tight barrier at the pinion interface. Its nitrile construction is selected for sealing consistency, while the spring material supports stable contact at the sealing lip. This part is a direct-fit style service component for a wide range of Ford and Lincoln trucks, vans, and SUVs, including Ford F-150, Ford E-150, Ford Expedition, Lincoln Navigator, and Lincoln Blackwood applications listed below. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Differential fluid seepage at the pinion seal area
• Contamination entering the differential through a worn seal
• Noise or wear concerns related to low lubricant level
• Seal deterioration from age, heat, and road exposure
• Service needs on front inner differential pinion locations

Installation Notes and Fitment

Install only after confirming housing bore, shaft diameter, and seal dimensions match the original part. Clean the sealing surface and inspect the pinion area for wear before installation. Compatible with these applications:

• Fits 2004 Ford E-150, Front Inner, to 08/02/2004
• Fits 2004 Ford E-150 Club Wagon, Front Inner, to 08/02/2004
• Fits 1975-2004 Ford F-150, Front Inner
• Fits 2004 Ford F-150 Heritage, Front Inner
• Fits 2003 Ford E-150, Front Inner
• Fits 2003 Ford E-150 Club Wagon, Front Inner
• Fits 1975-2002 Ford E-150 Econoline, Front Inner
• Fits 1975-2002 Ford E-150 Econoline Club Wagon, Front Inner
• Fits 1997-2002 Ford Expedition, Front Inner
• Fits 2002 Lincoln Blackwood, Front Inner
• Fits 1998-2002 Lincoln Navigator, Front Inner
• Fits 1997-1999 Ford F-250, Front Inner, with Light Duty Suspension
• Fits 1965-1985 Ford F-250, Front Inner, with Light Duty Brakes
• Fits 1969-1983 Ford E-100 Econoline, Front Inner
• Fits 1975-1983 Ford E-100 Econoline Club Wagon, Front Inner
• Fits 1970-1983 Ford F-100, Front Inner

Quality Assurance

InMotion manufactures this seal from nitrile with SAE 1008 spring material and published dimensional specifications for accurate service selection. Verify fitment against the original seal dimensions and vehicle configuration before installation. Part number WS4148 is listed for front inner differential pinion seal applications across the covered Ford and Lincoln platforms.