This GM 10.5" 14 Bolt Master Overhaul Kit is designed for rebuilding 19891998 GM 14 Bolt truck rear differentials used in heavy-duty towing, commercial, and off-road applications. The kit includes Timken bearings and races along with seals, shims, hardware, and setup materials commonly replaced during differential service.

GM 10.5" 14 Bolt axles are widely known for their strength and large ring gear design, but proper bearing preload and gear setup remain critical. This version uses the early-style pinion seal with a 2.200" hub diameter and includes the correct pilot bearing configuration for 19891998 axle assemblies.

Includes:

• Carrier Bearings and Races
• Pinion Bearings and Races
• Pilot Bearing
• Pinion Seal
• Complete Shim Kit
• Pinion Nut
• Crush Sleeve
• Thread Locker
• Gear Marking Compound with Brush
• Differential Gasket

Note:

• Ring gear bolts are NOT included with this kit.

Specifications

• Fits GM 10.5" 14 Bolt rear differentials
• Designed for 19891998 GM truck axle applications
• Includes Timken bearings and races
• Includes pilot bearing and pinion seal
• Uses early-style 2.200" hub diameter pinion seal
• Complete shim and setup hardware kit included
• Uses HM903210 / HM903249 pinion bearing configuration

Fitment

Fitment Notes:

• Fits GM 10.5" 14-Bolt rear differential applications only
• Designed for 19891998 axle configurations
• Uses early-style pinion seal with 2.200" hub diameter
• Verify axle type before ordering

Tech Insight

The GM 10.5" 14-Bolt rear axle is widely used in heavy-duty truck applications because of its large pinion support, massive carrier bearings, and strong ring gear design. Even with its reputation for durability, worn bearings, crushed preload spacers, and fatigued shim packs can create gear noise and premature wear over time.

When rebuilding a 14-Bolt differential, replacing all preload and bearing components is critical to maintaining correct backlash and gear tooth contact patterns. Reusing worn crush sleeves or bearings can result in inconsistent preload, excessive heat, and shortened gear lifeespecially in towing and off-road applications where driveline load is significantly increased.