InMotion WS5121 Wheel Seal - Front Inner

Front Inner Differential Pinion Seal

The InMotion WS5121 is a nitrile seal built for the front inner position on select Chrysler, Dodge, and Plymouth applications. It helps keep gear oil in place while blocking dirt, moisture, and road debris from reaching sensitive differential components.

With a 1.94 inside diameter, 2.6259999999999999 outside diameter, and 0.255 width, this seal is sized for a precise housing and shaft interface. The WS5121 is a direct-fit service part for vehicles such as the Dodge Charger, Dodge Dart, and Chrysler Newport.

Key Features

• Brand: InMotion
• Part number: WS5121
• Material: Nitrile
• Inside diameter: 1.94
• Outside diameter: 2.6259999999999999
• Width: 0.255
• Shaft diameter: 1.94
• Housing bore: 2.6219999999999999
• Front inner seal location

Detailed Description

InMotion WS5121 is a differential pinion seal engineered for a secure sealing surface in driveline service. Its nitrile construction is selected for sealing performance in oil-exposed environments, helping maintain differential fluid integrity and reduce contamination at the pinion area. This part number is listed for a wide range of rear-wheel-drive and truck applications, including Chrysler Fifth Avenue, Dodge D150, Dodge Ramcharger, and Plymouth PB350.

For buyers searching by fitment, this seal covers front inner applications on 1973-1989 Chrysler, Dodge, and Plymouth vehicles, including models such as Dodge Charger, Dodge Monaco, Dodge Dart, and Chrysler Town & Country. If you are replacing a leaking front inner differential pinion seal, WS5121 provides the dimensional match needed for service work on the listed axle configurations.

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

Common Problems It Helps Address

• Gear oil seepage at the front inner differential pinion area
• Contamination from dirt, water, and road debris entering the seal surface
• Wear-related leakage around the pinion shaft interface
• Loss of differential fluid that can affect driveline operation
• Service replacement for aged or hardened original seals

Installation Notes and Tips

Confirm the axle configuration, seal dimensions, and front inner position before installation. Clean the housing bore and shaft sealing surface thoroughly, and inspect for scoring or wear that could affect sealing performance. Proper seating depth and alignment are important for a reliable seal on the WS5121.

Compatible With: Fits 1973-1989 Chrysler, Dodge, and Plymouth front inner applications, including Chrysler Fifth Avenue, Imperial, New Yorker, Newport, LeBaron, and Town & Country; Dodge B100, B200, B300, B350, D100, D150, D200, D250, D350, Aspen, Charger, Challenger, Dart, Magnum, Monaco, and Ramcharger; Plymouth PB150, PB250, and PB350. Select Dodge B150/B250/D150/D250/Ramcharger and B100/B200/B300/D200/D100/D150/D200/Ramcharger applications require 3,000lb or 3,300lb axle configurations as listed.

Quality Assurance

InMotion manufactures this seal with precision-focused dimensions and nitrile material selection for differential service. The WS5121 is built to meet the sealing demands of the listed front inner applications and support dependable driveline maintenance.