InMotion WTHM88648 Differential Pinion Bearing - Front Inner or Rear Inner

Differential Pinion Bearing for Driveline Service

The InMotion WTHM88648 differential pinion bearing is built for front inner and rear inner axle applications that require a tapered bearing with stable rotational support. With a 1.4059999999999999 in. (35.72 mm) inside diameter and 1 in. (25.4 mm) width, it is sized for specific Spicer axle and ring gear applications across Ford, Jeep, Mazda, Lincoln, Mercury, and Dodge platforms.

Use WTHM88648 when servicing differential pinion wear, noise, or looseness in compatible axle assemblies. This bearing is a direct-fit driveline component for vehicles such as the Ford Ranger, Jeep Wrangler, and Jeep Cherokee in the listed configurations.

Key Features

• Tapered differential pinion bearing for axle and driveline service
• Inside diameter: 1.4059999999999999 in. / 35.72 mm
• Width: 1 in. / 25.4 mm
• Cone radius: 0.14000000000000001 in. / 3.6 mm
• Cylindrical attribute listed for dimensional reference
• Built for smooth rotation, reduced friction, and stable bearing support
• Compatible with multiple front inner and rear inner applications

Detailed Description

InMotion WTHM88648 is a differential pinion bearing intended for axle assemblies that use a tapered bearing design. The bearing’s dimensions and construction support proper pinion shaft operation in compatible Spicer 35-SLA, Spicer 35C, Spicer 30-SF, Spicer 35, and select 6.75/6.7 in. ring gear applications. It is a practical replacement for driveline service where bearing wear can affect gear mesh, rotational smoothness, and axle stability. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Compatible With Ford Ranger, Jeep Wrangler, Jeep TJ, Jeep Cherokee, and related models listed below, this bearing is a focused solution for differential repair work. The part number WTHM88648 is useful when matching an existing bearing by specification or when verifying axle configuration during service.

What It Helps Address

• Pinion bearing noise from wear or surface damage
• Excessive driveline play in the differential assembly
• Rough or inconsistent pinion rotation
• Friction-related heat and accelerated bearing wear
• Stability issues in axle assemblies with matching Spicer configurations

Fitment Notes

• Fits 1998-2011 Ford Ranger, Front Inner, with Spicer 35-SLA Axle
• Fits 1990-1997 Ford Ranger, Front Inner, with Spicer 35 Axle
• Fits 1983-1984 Ford Ranger, Rear Inner, with 6.7in Ring Gear
• Fits 1995-2001 Ford Explorer, Front Inner, with Spicer 35-SLA Axle
• Fits 1991-1994 Ford Explorer, Front Inner, with Spicer 35 Axle
• Fits 2002-2005 Ford Explorer, Front Inner, with Spicer 30-SF Axle
• Fits 2001-2005 Ford Explorer Sport Trac, Front Inner, with Spicer 35-SLA Axle
• Fits 2003-2005 Ford Explorer Sport, Front Inner, with Spicer 35-SLA Axle
• Fits 2002 Ford Explorer Sport, Front Inner, with Spicer 30-SF Axle
• Fits 1998-2010 Mazda B4000, Front Inner, with Spicer 35-SLA Axle
• Fits 1994-1997 Mazda B4000, Front Inner, with Spicer 35 Axle
• Fits 2005-2008 Mazda B3000, Front Inner, with Spicer 35-SLA Axle
• Fits 1998-2002 Mazda B3000, Front Inner, with Spicer 35-SLA Axle
• Fits 1991-1994 Mazda Navajo, Front Inner, with Spicer 35 Axle
• Fits 2003-2005 Lincoln Aviator, Front Inner, with Spicer 30-SF Axle
• Fits 2002-2005 Mercury Mountaineer, Front Inner, with Spicer 30-SF Axle
• Fits 1997-2001 Mercury Mountaineer, Front Inner, with Spicer 35-SLA Axle
• Fits 1997-1999 Dodge Dakota, Front Inner, with Spicer 35-SLA Axle
• Fits 1998-1999 Dodge Durango, Front Inner, with Spicer 35-SLA Axle
• Fits 1997-2007 Jeep Wrangler, Rear Inner, with Spicer 35C Axle
• Fits 1987-1995 Jeep Wrangler, Rear Inner, with Spicer 35C Axle
• Fits 1997-2006 Jeep TJ, Rear Inner, with Spicer 35C Axle
• Fits 2002 Jeep Liberty, Rear Inner, with Spicer 35C Axle
• Fits 1999-2004 Jeep Grand Cherokee, Rear Inner, with Spicer 35 Axle
• Fits 1993-1998 Jeep Grand Cherokee, Rear Inner, with Spicer 35C Axle
• Fits 1984-2001 Jeep Cherokee, Rear Inner, with Spicer 35C Axle
• Fits 1986-1992 Jeep Comanche, Rear Inner, with Spicer 35C Axle
• Fits 1984-1990 Jeep Wagoneer, Rear Inner, with Spicer 35C Axle
• Fits 1979-1982 Ford Fairmont, Rear Inner, with 6.75in Ring Gear
• Fits 1979-1982 Ford Mustang, Rear Inner, with 6.75in Ring Gear
• Fits 1979-1980 Ford Pinto, Rear Inner, with 6.75in Ring Gear
• Fits 1979-1982 Mercury Capri, Rear Inner, with 6.75in Ring Gear
• Fits 1979-1982 Mercury Zephyr, Rear Inner, with 6.75in Ring Gear
• Fits 1979-1980 Mercury Bobcat, Rear Inner, with 6.75in Ring Gear

Installation Notes and Tips

Verify axle type, bearing dimensions, and position before installation. Match the front inner or rear inner location exactly to the vehicle’s differential setup, and confirm the Spicer axle or ring gear specification listed for the application. Clean and inspect the pinion shaft, races, and related sealing surfaces during service to help ensure proper bearing seating and gear alignment.

Quality Assurance

InMotion positions this bearing as a multi-purpose, high-quality component for automotive and industrial use, with an emphasis on durable materials and consistent operation across demanding environments. For driveline repair, WTHM88648 is specified to deliver reliable rotational support in the listed axle applications.