The Eaton Detroit Truetrac Differential (Part #915A387) is a heavy-duty, helical-gear limited-slip differential built for Dana 60 axles with 35-spline shafts and 4.10 & down gear ratios. Engineered for strength, traction, and reliability, the Truetrac automatically transfers torque to the wheel with the most traction—enhancing stability and control in both on-road and off-road environments.

The Truetrac’s proven all-gear design eliminates clutches and friction plates, providing quiet, maintenance-free operation with consistent torque bias. Ideal for high-torque vehicles, work trucks, and off-road builds, it delivers dependable performance in any traction condition—from towing on pavement to rock crawling in rugged terrain.

Features:

• Helical-gear limited-slip differential automatically improves traction

• Maintenance-free, all-gear construction with no wearable clutch packs

• Smooth and quiet operation for versatile driving conditions

• Optimized for Dana 60 axles with 4.10 & down gear ratios

• Handles high torque loads typical of heavy-duty and off-road applications

• Perfect balance of durability, performance, and control

Specifications:

Fitment:
Designed for Dana 60 front axles used in heavy-duty trucks, vans, and SUVs across multiple makes and model years.

• 1971–1993: Chrysler, Dodge, Ram, Plymouth – Small, ½-Ton, ¾-Ton, and 1-Ton Trucks, Vans, Wagons (Front Dana 60 HD, 4.10 & Down)

• 1974–2020: Ford – ¾-Ton and 1-Ton Trucks, Vans, Wagons, SUVs, and Cab & Chassis (Front Dana 60, 4.10 & Down)

• 1975–1991: General Motors – ¾-Ton Trucks (Front Dana 60 HD, 4.10 & Down)

• 1977–1987: General Motors – 1-Ton Trucks, Vans, Cab & Chassis, Motor Homes, Buses (Front Dana 60 HD, 4.10 & Down)

Ideal Usage:

• Off-Road: Rock Crawl, Light Trail, Sand Sports, Extreme Off-Road, Work Truck / Towing

This Part Fits: