Eaton Detroit Truetrac Differential EAT912A556, 28-Spline Rear Differential for 8.5-Inch Applications

The Detroit Truetrac is a helical-gear style, limited-slip differential that maximizes wheel traction and enhances driving characteristics. Maintenance-free, it features smooth, automatic operation in forward and reverse. Its versatility makes Detroit Truetrac the ideal traction solution for almost any type of vehicle. Detroit Truetrac® Differential; 28 Spline; 1.20 in. Axle Shaft Diameter; 2.73 And Up Ring Gear Pinion Ratio; Rear; 8.5 in.;

• Optimized Torque Bias Ratios Deliver Max Acceleration And Handling
• No Special Lubrication Or Friction Modifiers Needed
• Helical Gear Limited Slip Differential
• Durable; Smooth; Quiet Operation
• Works In Forward And Reverse
• Ideal For Most Vehicles
• Automatic Engagement

The Eaton Detroit Truetrac EAT912A556 is a helical-gear limited-slip differential designed to improve traction, acceleration, and handling in a wide range of rear-wheel-drive vehicles. Its automatic torque-biasing operation helps transfer power to the wheel with greater traction without requiring driver intervention, providing smooth performance in both forward and reverse.

Engineered for rear 8.5-inch differential applications with 28-spline axle compatibility, the Detroit Truetrac is suitable for vehicles using a 2.73-and-up ring gear and pinion ratio. Its maintenance-free design does not require special lubrication or friction modifiers, helping simplify installation and long-term ownership. The durable gear-driven construction delivers quiet, predictable operation for street, performance, and general vehicle applications.

• Brand: Eaton
• Part Number: EAT912A556
• Application: Rear differential
• Differential Type: Helical-gear limited-slip differential
• Axle Compatibility: 28-spline axle shafts
• Axle Shaft Diameter: 1.20 inches
• Ring Gear Compatibility: 8.5-inch applications
• Gear Ratio Compatibility: 2.73 and higher

What's Included: One Eaton Detroit Truetrac limited-slip differential assembly. Confirm axle, spline, housing, and gear-ratio compatibility before installation. Vehicle-specific fitment information should be verified using the vehicle application and rear axle details.

Features:

• Optimized torque-bias ratios improve acceleration and handling by directing power toward the wheel with available traction.
• Maintenance-free design requires no special lubricant or friction modifiers when installed with the appropriate differential fluid.
• Helical-gear limited-slip operation provides smooth, automatic traction management without electronic controls.
• Durable construction delivers quiet, consistent performance in both forward and reverse operation.

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1