Timken HM88648 Differential Pinion Bearing - Front Inner or Rear Inner

Timken HM88648 Differential Pinion Bearing

Timken HM88648 is a tapered roller differential pinion bearing built for driveline service where radial and axial load control matter. With a 1.406 in. inside diameter and 35.72 mm bore, it is used in front inner and rear inner pinion locations across a wide range of Ford, Jeep, Mazda, and Mercury applications.

Key Features

• Tapered roller bearing construction for combined radial and axial load handling
• Inside diameter: 1.406 in. / 35.72 mm
• Cone radius: 0.138 in. / 3.50 mm
• Timken engineering for durable differential pinion support
• Used in front inner and rear inner axle positions depending on application
• Cross-reference: National HM88648

Detailed Description

The HM88648 differential pinion bearing is a Timken tapered roller bearing designed for pinion support in Dana/Spicer 35 and 35C axle applications, as well as select 6.75 in. ring gear rear axle setups. It is commonly selected for Ford Ranger, Ford Explorer, Jeep Wrangler, Jeep Cherokee, Mazda B3000, and related driveline service where precise pinion bearing fit is required. Timken tapered roller bearing components are engineered for compact packaging while managing both thrust and radial loads, helping maintain differential alignment and smooth gear operation. This part number, HM88648, is also cross-referenced as National HM88648 for the same application.

Vehicle Fitment

• Fits 2001-2011 Ford Ranger, Front Inner
• Fits 2000-2005 Ford Explorer, Front Inner
• Fits 2001-2005 Ford Explorer Sport Trac, Front Inner
• Fits 2001-2003 Ford Explorer Sport, Front Inner
• Fits 1991-1999 Ford Explorer, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1983-1999 Ford Ranger, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1990-1997 Ford Aerostar, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1984-1990 Ford Bronco II, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 2006-2008 Jeep Commander, Rear Inner, Dana/Spicer 35C Axle
• Fits 1993-2008 Jeep Grand Cherokee, Rear Inner, Dana/Spicer 35C Axle
• Fits 1997-2008 Jeep Wrangler, Rear Inner, Dana/Spicer 35C Axle
• Fits 1987-1995 Jeep Wrangler, Rear Inner, Dana/Spicer 35C Axle
• Fits 1997-2006 Jeep TJ, Rear Inner, Dana/Spicer 35C Axle
• Fits 1984-2001 Jeep Cherokee, Rear Inner, Dana/Spicer 35C Axle
• Fits 1986-1992 Jeep Comanche, Rear Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1984-1988 Jeep J10, Rear Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1984-1988 Jeep J20, Rear Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1994-2009 Mazda B4000, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 2005 Mazda B3000, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1998-2002 Mazda B3000, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1994-1996 Mazda B3000, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1995-1996 Mazda B2300, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1991-1994 Mazda Navajo, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1991-1993 Mazda B2600, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 2001-2002 Mazda Tribute, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1997-2001 Mercury Mountaineer, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 2000-2001 Mercury Mountaineer, Front Inner
• Fits 1997-1999 Dodge Dakota, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1998-1999 Dodge Durango, Front Inner, Differential Pinion Race for Dana/Spicer 35 Axle compatible with Manual Transmission
• Fits 1978-1983 Ford Fairmont, Rear Inner, Differential Pinion Bearing - Fits 6.75 in. Ring Gear
• Fits 1979-1983 Ford Mustang, Rear Inner, Differential Pinion Bearing - Fits 6.75 in. Ring Gear
• Fits 1979-1982 Ford LTD, Rear Inner, Differential Pinion Bearing - Fits 6.75 in. Ring Gear
• Fits 1979-1982 Ford Thunderbird, Rear Inner, Differential Pinion Bearing - Fits 6.75 in. Ring Gear
• Fits 1979-1980 Ford Pinto, Rear Inner, Differential Pinion Bearing - Fits 6.75 in. Ring Gear
• Fits 1979-1980 Mercury Bobcat, Rear Inner, Differential Pinion Bearing - Fits 6.75 in. Ring Gear
• Fits 1979-1982 Mercury Capri, Rear Inner, Differential Pinion Bearing - Fits 6.75 in. Ring Gear
• Fits 1979-1980 Mercury Monarch, Rear Inner, Differential Pinion Bearing - Fits 6.75 in. Ring Gear

Common Repair Uses

• Replacing a worn differential pinion bearing during axle rebuilds
• Correcting pinion noise caused by bearing wear or surface damage
• Restoring pinion support in Dana/Spicer 35 and 35C axle assemblies
• Addressing driveline looseness or rough rotation at the pinion end
• Servicing Ford Ranger, Jeep Wrangler, and Mazda B-series rear or front inner axle applications

Installation Notes

Replace the inner cone and outer cup together to maintain bearing life and reliability. Verify axle type, position, and year-specific fitment before installation, especially on Dana/Spicer 35 and 35C applications and manual-transmission listings. Proper setup of bearing preload and gear pattern is critical during differential service.

Quality Assurance

Timken is a recognized global leader in tapered roller bearings, with engineering focused on durability, load capacity, and long service life in compact driveline packaging. HM88648 is built to Timken bearing standards for differential pinion service.