InMotion WS51098 Wheel Seal - Rear, Rear Inner or Rear Outer

InMotion WS51098 Differential Pinion Seal

The InMotion WS51098 is a nitrile differential pinion seal built to keep contaminants out and gear oil in. With precise dimensions and a tight sealing profile, it supports reliable rear axle sealing for a wide range of Ford, Lincoln, Mercury, and Buick applications.

Key Features

• Nitrile sealing material for dependable fluid resistance
• Inside diameter: 1.5 in; shaft diameter: 1.5 in
• Outside diameter: 2.506 in; housing bore: 2.502 in
• Thickness and width: 0.437 in
• Engineered for rear differential pinion sealing
• Part number: WS51098

Detailed Description

InMotion WS51098 is a precision-made wheel seal used as a differential pinion seal in rear axle applications. The nitrile sealing material is selected for its ability to maintain a secure barrier against moisture, dirt, and road debris, helping protect sensitive internal differential components. This seal is a direct-fit style solution for many classic rear axle setups, including Ford F-100, Ford Bronco, Ford LTD, Lincoln Continental, and Mercury Marquis applications that use the specified ring gear or axle configuration. The part number WS51098 is also useful when cross-checking service records and ordering the correct rear pinion seal for restoration or maintenance work.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Solve

• Rear differential oil leaks at the pinion seal
• Contamination entering the differential housing
• Premature wear from moisture and debris intrusion
• Loss of sealing integrity on aging axle assemblies
• Service issues on rear axle rebuilds and restorations

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal width before installation. Confirm the axle or ring gear configuration listed in the fitment data, since many applications vary by axle rating or ring gear size. Clean the sealing surface thoroughly and inspect the pinion yoke or shaft for wear before installing the new seal. For best results, match the seal to the exact rear axle specification shown for your vehicle.

Quality Assurance

InMotion manufactures this seal with precision dimensions and nitrile sealing material to support consistent fit and sealing performance in the listed rear applications. Confirm fitment against your vehicle’s axle configuration before ordering.

Compatible Vehicles

• Fits 1980-1983 Ford F-100, rear, with 2,800lb axle(s)
• Fits 1969-1979 Ford E-100 Econoline, rear, with 3,300lb axle(s)
• Fits 1975-1979 Ford E-100 Econoline Club Wagon, rear, with 9in ring gear
• Fits 1975-1979 Ford E-150 Econoline, rear, with 3,300lb axle(s)
• Fits 1975-1979 Ford E-150 Econoline Club Wagon, rear, with 9in ring gear
• Fits 1970-1979 Ford F-100, rear, with 9in ring gear
• Fits 1967-1968 Ford F-100, rear, with 9in ring gear
• Fits 1965 Ford F-100, rear, with 9in ring gear
• Fits 1975-1979 Ford F-150, rear, with 9in ring gear
• Fits 1971-1978 Ford LTD, rear, with 9in ring gear
• Fits 1966-1977 Ford Bronco, rear, with 9in ring gear
• Fits 1953-1963 Ford F-100, rear
• Fits 1957-1959 Ford F-350, rear
• Fits 1953-1955 Ford F-350, rear
• Fits 1953-1955 Ford F-250, rear
• Fits 1978-1979 Lincoln Continental, rear
• Fits 1970-1973 Lincoln Continental, rear
• Fits 1958-1961 Lincoln Continental, rear
• Fits 1977-1979 Lincoln Versailles, rear, with 31 splines
• Fits 1980 Lincoln Versailles, rear inner
• Fits 1974-1979 Mercury Cougar, rear, with 9in ring gear
• Fits 1975-1979 Mercury Monarch, rear, with 9in ring gear
• Fits 1975 Mercury Montego, rear, with 9in ring gear
• Fits 1974 Mercury Montego, rear, with 8in ring gear
• Fits 1973 Mercury Montego, rear, with 7.75in ring gear
• Fits 1971-1972 Mercury Colony Park, rear, with 9.375in ring gear
• Fits 1972 Mercury Marquis, rear, with 9.375in ring gear
• Fits 1971 Mercury Marquis, rear, with 9in ring gear
• Fits 1967-1970 Mercury Marquis, rear
• Fits 1969-1970 Mercury Marauder, rear
• Fits 1966 Mercury Marauder, rear
• Fits 1966-1970 Mercury Colony Park, rear
• Fits 1957-1960 Mercury Colony Park, rear
• Fits 1966-1967 Mercury Villager, rear
• Fits 1965 Mercury Villager, rear, with Heavy Duty Axle
• Fits 1961-1965 Mercury Colony Park, rear, with Heavy Duty Axle
• Fits 1963-1965 Mercury Marauder, rear, with Heavy Duty Axle
• Fits 1963-1964 Buick LeSabre, rear
• Fits 1968-1970 Buick Riviera, rear
• Fits 1973 Ford Thunderbird, rear
• Fits 1957-1971 Ford Thunderbird, rear