National HB-88508-AB Drive Shaft Center Support

Drive Shaft Center Support for Heavy-Duty Trucks

The National HB-88508-AB drive shaft center support is built for driveline service where precise support and stable rotation matter. It is a direct-fit style replacement for select Dodge Ram 2500 and Ram 3500, Chevrolet C2500/C3500/K3500, GMC C2500/C3500/K3500, and related applications that use a slip yoke style setup with a 40 mm bearing inside diameter.

National manufactures this bearing and support assembly to meet or exceed OE quality standards, with premium bearing construction aimed at consistent performance and extended bearing life. The HB-88508-AB is a practical choice when servicing a worn center support on a drive shaft that uses Spicer 1410 Cleveland 055 U-joints and an oil slinger.

• Part number: HB-88508-AB
• Drive shaft center support for driveline repair
• 40 mm bearing inside diameter / 1.5748 in bore
• Outside diameter: 80 mm / 3.1496 in
• Width: 168.25 mm / 6.6240 in
• Centerline: 57.912 mm / 2.2800 in
• Designed for slip yoke style applications
• Includes bearing and support
• Cross-reference: Timken HB88508AB

Detailed Application Overview

This drive shaft center support is engineered around the dimensions and mounting pattern used in a wide range of full-size trucks and chassis applications. The bolt-hole spacing measures 168.148 mm, and the bearing bore is sized at 40 mm, helping ensure the support aligns correctly with the driveline geometry. If you are replacing a noisy, loose, or worn center support on a Dodge Ram 2500, Dodge Ram 3500, Chevrolet C2500, or GMC K3500, the HB-88508-AB provides the dimensional match needed for a proper repair.

National HB-88508-AB is also listed with interchange references including SKF HB88508-AB and Spicer 210866-1X for the same application family.

What It Helps Repair

• Driveline vibration caused by a worn center support bearing
• Noise from a failing drive shaft support assembly
• Excess movement in the drive shaft center section
• Wear related to aging oil slinger and bearing components
• Fitment issues on trucks using the specified 40 mm bearing bore and slip yoke style layout

Installation Notes and Tips

Verify the bearing inside diameter, bolt-hole spacing, centerline measurement, and drive shaft configuration before installation. This part is listed for vehicles using Spicer 1410 Cleveland 055 U-joints and an oil slinger, so matching those details is important for correct fitment. For best results, inspect the surrounding driveline components for wear before installing the new center support.

Compatible With: Fits 1994-2002 Dodge Ram 2500, N/A; Fits 1994-2002 Dodge Ram 3500, N/A; Fits 1988-2000 Chevrolet C2500, N/A; Fits 1988-2000 Chevrolet C3500, N/A; Fits 1997-2000 Chevrolet K3500, N/A; Fits 1999-2000 Chevrolet Silverado 2500, N/A; Fits 1988-2000 GMC C2500, N/A; Fits 1988-2000 GMC C3500, N/A; Fits 1997-2000 GMC K3500, N/A; Fits 1985-1986 GMC K3500, N/A; Fits 1999-2000 GMC Sierra 2500, N/A; Fits 1992-1999 Chevrolet K1500, N/A; Fits 1991-1999 Chevrolet P30, N/A; Fits 1997-1999 GMC K1500, N/A; Fits 1991-1999 GMC P3500, N/A; Fits 1996 Dodge Ram 1500, N/A; Fits 1989-1993 Dodge D150, N/A; Fits 1990-1993 Dodge D250, N/A; Fits 1990-1993 Dodge D350, N/A; Fits 1990-1993 Dodge W250, N/A; Fits 1989-1991 Chevrolet V3500, N/A; Fits 1987-1991 GMC V3500, N/A; Fits 1989 Chevrolet R2500, N/A; Fits 1989 Dodge D100, N/A; Fits 1988-1989 GMC R2500, N/A; Fits 1988 Chevrolet R20, N/A; Fits 1987-1988 Chevrolet V30, N/A; Fits 1985-1986 Chevrolet K30, N/A.

Quality Assurance

National positions this bearing and support assembly as an OE-quality replacement built to exacting standards for lasting performance and extended bearing life. The HB-88508-AB is a National driveline component designed for consistent service in demanding truck applications.