Eaton Detroit Truetrac Differential EAT913A555, 30-Spline Rear 8.875-Inch, 3.08–3.90 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; 30 Spline; 1.29 in. Axle Shaft Diameter; 3.08 - 3.90 Ring Gear Pinion Ratio; Rear 8.875 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

Brief Description: The Eaton Detroit Truetrac EAT913A555 is a helical-gear limited-slip differential designed to improve traction, acceleration, and handling across a wide range of vehicles. Its automatic operation helps transfer torque to the wheel with greater traction without requiring driver input, providing smooth performance in both forward and reverse.

Built for rear applications using an 8.875-inch ring gear and 30-spline axle configuration, this Detroit Truetrac differential is engineered for dependable performance and long service life. The maintenance-free design operates without special lubrication or friction modifiers, helping simplify installation and ongoing ownership. Its quiet, smooth operation makes it suitable for street-driven vehicles, performance applications, and other vehicles that require enhanced traction without the complexity of an actively controlled differential.

Key Product Specifications & Technical Data:

• Brand: Eaton
• Part Number: EAT913A555
• Product Type: Detroit Truetrac helical-gear limited-slip differential
• Application Position: Rear
• Ring Gear Size: 8.875 inches
• Axle Spline Count: 30 spline
• Axle Shaft Diameter: 1.29 inches
• Compatible Ring Gear and Pinion Ratio: 3.08–3.90

What's Included: One Eaton Detroit Truetrac differential assembly. Installation hardware, bearings, seals, and lubricant are not specified and should be confirmed before installation.

Fitment: Designed for compatible rear differentials using an 8.875-inch ring gear, 30-spline axles, a 1.29-inch axle shaft diameter, and a 3.08–3.90 ring gear and pinion ratio. Verify vehicle-specific fitment, axle configuration, and manufacturer installation requirements before purchase.

Features:

• Optimized torque bias ratios help improve acceleration and handling by directing torque toward the wheel with available traction.
• Maintenance-free operation does not require special lubrication or friction modifiers.
• Helical-gear limited-slip design provides automatic traction control without manual engagement.
• Durable construction delivers smooth, quiet operation 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