The Eaton Detroit Truetrac Differential (Part #917A732) is a robust, helical-gear limited-slip differential designed for GM 9.5" and 9.75" axles with 33-spline shafts and 3.42 or 3.73 gear ratios. Known for its strength, smooth operation, and maintenance-free design, the Truetrac automatically transfers torque to the wheel with the most traction—delivering exceptional control and stability under varying load and terrain conditions.

Built entirely with precision-cut gears and no wearable clutch components, the Truetrac provides quiet, consistent, and durable performance for heavy-duty trucks, high-torque street builds, and off-road vehicles.

Note: The factory oil drain plug may require minor relief grinding for proper fitment. Eaton recommends using a GL-5 rated 80W-90 petroleum-mineral based gear oil and avoiding synthetic oils or friction modifiers for best performance.

Features:

• Helical-gear limited-slip design for smooth, automatic torque transfer

• Maintenance-free operation—no clutch packs or additives needed

• All-gear construction for long-lasting strength and reliability

• Optimized for GM 9.5"/9.75" axles with 33-spline shafts and 3.42–3.73 gear ratios

• Factory drain plug may need minor relief grinding for installation clearance

• Perfect for street, towing, and off-road performance applications

Specifications:

Fitment:
Designed for GM 9.5" / 9.75" rear axles, commonly used in late-model GM trucks and SUVs. Ideal for applications requiring improved traction and control under load.

Ideal Usage:

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

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

This Part Fits: