The Eaton Detroit Truetrac Differential (Part #914A538) is a heavy-duty, helical-gear limited-slip differential designed for GM 9.5-inch (14-bolt) rear axles with 33-spline shafts and compatible with all gear ratios. Built to deliver superior traction, stability, and durability, the Truetrac automatically transfers torque to the wheel with the most grip—enhancing vehicle control without any driver intervention.

Ideal for high-torque trucks, performance vehicles, and off-road builds, the Truetrac’s maintenance-free all-gear design provides quiet, smooth operation and consistent performance throughout its service life. It’s the perfect upgrade for drivers seeking a reliable, no-maintenance alternative to traditional clutch-type limited-slip differentials.

Features:

• Helical-gear limited-slip design automatically biases torque for superior traction

• Maintenance-free—no clutches, friction plates, or special additives required

• All-gear construction for exceptional strength and longevity

• Smooth, quiet operation with instant torque transfer under load

• Compatible with all gear ratios for GM 9.5" (14-bolt) axles

• Perfect for towing, off-road performance, and high-horsepower applications

Specifications:

Fitment:
Designed for GM 9.5-inch (14-bolt) rear axles, commonly found in full-size trucks, vans, and SUVs.

• 1981–2022: GM ½-Ton Trucks – Rear 14-Bolt C-Clip (All Ratios)

• 1981–2012: GM ¾-Ton Trucks – Rear 14-Bolt C-Clip (All Ratios)

• 1988–2012: GM 1-Ton Trucks, Vans, Cab & Chassis, Motorhomes, Buses – Rear 14-Bolt C-Clip (All Ratios)

• 2003–2009: Hummer H1, H2, H3 – Rear (H2, All Ratios)

Ideal Usage:

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

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

This Part Fits: