Detroit Locker 912A557 Eaton Detroit Truetrac Limited-Slip Differential GM 8.5" 10-Bolt 28-Spline

The Detroit Locker 912A557 is an Eaton Detroit Truetrac helical-gear style limited-slip differential designed for GM 8.5-inch 10-bolt front axle applications. This advanced differential uses a patented design of parallel-axis planetary helix gears to provide quiet, automatic torque splitting and enhanced traction in all driving conditions.

Key Features:

• Helical gear limited-slip design eliminates wearable clutch packs for maintenance-free operation
• 28-spline axle shaft compatibility with 1.20-inch diameter axles
• Compatible with gear ratios from 2.73:1 through 5.13:1
• Smooth, automatic engagement in forward and reverse
• Steel construction with 10-bolt cover pattern
• Performs like a limited-slip under normal driving, automatically transferring torque to the wheel with better traction when needed
• No special lubricants or friction modifiers required - uses standard GL-5 80W90 petroleum-based gear oil

Important Installation Note: All Eaton differentials for GM 8.5-inch axles require special carrier bearings. For axles with small bearing bores (race O.D. of 2.89 inches), typically found on vehicles prior to 1999, bearing LM102949 and race LM102911 are required. Manual locking hubs are recommended for front axle applications. Ideal for work trucks, towing, drag racing, light trail use, street performance, and restoration applications.