Eaton 913A614 Detroit Truetrac Helical Gear Limited Slip Differential - Dana 44HD, 30 Spline

The Eaton Detroit Truetrac® 913A614 is a helical-gear style, limited-slip differential engineered for the Dana 44HD rear axle with 30-spline axles. As the first helical gear differential introduced into the automotive aftermarket under the Eaton brand, the Detroit Truetrac remains the industry benchmark for smooth, maintenance-free traction improvement.

Unlike clutch-pack or friction-based differentials, the Truetrac uses a patented parallel-axis planetary helical gear design that requires no wearable friction components. Under normal driving conditions, it operates exactly like a standard open differential—quiet, smooth, and unobtrusive. When a wheel begins to lose traction, the helical gears mesh with increasing force, automatically transferring torque to the wheel with better grip until wheel spin is slowed or stopped. When traction is restored, the unit seamlessly returns to normal operation—all without any driver input.

Key Features:

• Helical gear limited-slip design — no clutches, cones, or friction discs to wear out
• Automatic engagement — operates in both forward and reverse without driver action
• Optimized torque bias ratios for maximum acceleration and handling balance
• Maintenance-free — no special additives or friction modifiers required
• Dana 44HD fitment — 30-spline axle configuration
• Durable, smooth, and quiet operation on-road and off-road
• Compatible with petroleum/mineral-based GL-5 80W90 gear oil (no synthetic or friction modifiers)
• Comes fully pre-assembled and ready to install

The Detroit Truetrac 913A614 is an ideal traction upgrade for performance, off-road, and daily-driven vehicles seeking confident, predictable handling. Its proven design delivers a lifetime of torque bias retention without the need for electronic connections, software integration, or periodic servicing.