The Eaton Detroit Truetrac Differential (Part #912A585) is a proven helical-gear limited-slip differential designed for superior traction, smooth engagement, and long-lasting durability. Engineered for Dana 30 axles with 27 splines and 3.73 & up gear ratios, this Truetrac unit delivers exceptional performance both on and off the road. With no clutch packs to wear out, it provides quiet, maintenance-free operation—making it ideal for vehicles that demand dependable traction in all driving conditions.

Compatible with non-axle disconnect style housings only, the Truetrac automatically senses and transfers torque to the wheel with the most traction, ensuring maximum control in challenging terrain or high-performance environments.

Features:

• Helical-gear, torque-biasing design for smooth, automatic operation

• Maintenance-free—no clutches or friction plates to replace

• Enhances traction in slippery, off-road, and performance conditions

• Durable, all-gear construction for long service life

• Ideal for both on-road and off-road performance applications

Specifications

Fitment:

• Designed for Dana 30 axles with 27-spline shafts

• Fits applications using 3.73 & higher gear ratios

• Commonly used in Jeep and light 4x4 vehicles equipped with Dana 30 front axles

• Suitable for:

  • Off-Road: Rock Crawl, Light Trail, Extreme Off-Road, Sand Sports

  • On Road: Street & Muscle, Circle Track, Drag Racing, Restoration, Towing / Work Truck