Timken 78225C Differential Pinion Bearing - Rear Inner

Timken differential pinion bearing

The Timken 78225C is a tapered roller differential pinion bearing built for heavy-duty driveline service. It is a direct replacement for applications that need to manage both radial and axial loads with compact bearing support.

Key features

• Tapered roller bearing construction for combined load handling
• Engineered for higher speeds and heavier loads
• Compact design for durable driveline support
• Timken bearing technology backed by global engineering support

Detailed description

Timken 78225C is a differential pinion bearing used in heavy-duty axle assemblies where stable support and long service life matter. This part number is specified for Ford B-600, Ford B-700, Ford CF7000, Ford CF8000, Ford F-600, Ford F-700, Ford F-800, and related Ford medium- and heavy-duty truck applications with the Rockwell 23240 axle in the rear inner position. The 78225C is also referenced as BR78225 for cross-reference purposes. Timken recommends replacing the cone and cup together to help maintain reliability and bearing life.

Common issues this part addresses

• Excessive pinion bearing wear in the differential
• Noise from a worn rear inner bearing location
• Reduced driveline stability under load
• Loss of smooth axle operation in heavy-duty service

Installation notes and tips

Verify axle identification and match the Rockwell 23240 application before ordering. Inspect the mating cup and replace both bearing components together when servicing the differential pinion assembly. Confirm the rear inner position and compare the old bearing to part number 78225C during installation.

Quality assurance

Timken is a recognized global leader in tapered roller bearings, with engineering focused on durability and load capacity. The 78225C reflects that bearing expertise for demanding driveline applications.