American Axle & Manufacturing 40010355 Differential Crush Sleeve Collapsible Spacer

The American Axle & Manufacturing 40010355 is an OE-quality collapsible spacer crush sleeve designed for GM differential applications. This critical pinion bearing preload component ensures proper bearing spacing and torque settings during differential assembly and rebuild operations.

Key Features:

• Genuine AAM OE-specification crush sleeve for proper pinion bearing preload
• Fits GM 8.25-inch IFS front differentials (2007 and newer models)
• Compatible with GM 8.5-inch and 8.6-inch 10-bolt rear differentials (1982 and newer)
• Replaces GM part number 12479162
• Manufactured by American Axle & Manufacturing to OEM standards

This collapsible spacer is a one-time-use component that must be replaced whenever the pinion nut is removed during differential service. Proper installation ensures correct pinion bearing preload, which is essential for differential longevity and optimal performance. Commonly included in differential pinion seal kits and rebuild packages for GM trucks, SUVs, and light-duty vehicles equipped with AAM-manufactured differentials.