Eaton Detroit Truetrac Differential, 28-Spline, Rear 9-Inch Axle, 3.25 and Up Gear Ratio

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; Rear 9 in.; 3.25 And Up Ring Gear Pinion Ratio;

• 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 differential is a helical-gear limited-slip differential designed to improve traction, acceleration, and handling in rear-wheel-drive vehicles equipped with a 9-inch rear axle. Part number EAT912A587 uses automatic torque-biasing technology to redirect power to the wheel with available traction, helping maintain forward motion during varying road and driving conditions.

Designed for 28-spline axle applications with a 1.20-inch axle shaft diameter and 3.25-and-up ring gear and pinion ratios, the Detroit Truetrac operates smoothly in both forward and reverse. Its maintenance-free design requires no special lubrication or friction modifiers, simplifying installation and long-term service requirements. The helical gear arrangement provides durable, quiet operation without the complexity of clutch-style limited-slip components.

The Eaton Detroit Truetrac is suitable for a broad range of vehicles and performance applications where dependable traction and predictable handling are important. Automatic engagement requires no driver input, allowing the differential to respond as traction conditions change. This differential is intended for compatible rear 9-inch axle configurations and should be matched to the vehicle’s axle spline count, shaft diameter, and gear ratio before installation.

Key Product Specifications & Technical Data

• Brand: Eaton
• Part Number: EAT912A587
• Differential Type: Helical-gear limited-slip differential
• Axle Position: Rear
• Axle Type: 9-inch rear axle
• Axle Spline Count: 28 spline
• Axle Shaft Diameter: 1.20 inches
• Compatible Gear Ratio: 3.25 and up ring gear and pinion ratio

What's Included

One Eaton Detroit Truetrac differential assembly. Installation hardware, lubricant, seals, bearings, and other vehicle-specific components are not included unless supplied by the vehicle or axle manufacturer.

Features:

• Optimized Torque Biasing: Helps maximize acceleration and handling by transferring torque toward the wheel with available traction.
• Automatic Engagement: Responds to changing traction conditions without requiring driver input.
• Maintenance-Free Design: Requires no special lubrication or friction modifiers for normal operation.
• Smooth, Quiet Operation: Durable helical gear construction supports consistent performance in forward and reverse.

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