Truetrac Holden ZF 32 Spline

The Harrop Truetrac® is one of the most trusted and proven helical gear limited slip differentials available today, delivering exceptional traction, durability and drivability across a wide range of street, performance and off-road applications.

Originally developed by Eaton, the pioneer of helical gear differential technology in the automotive aftermarket, the Truetrac was the first gear-driven limited slip differential of its kind and remains the industry's benchmark for smooth, reliable torque biasing. Unlike conventional clutch-type LSDs, the Truetrac utilises a patented arrangement of precision-machined helical gears to automatically transfer torque to the wheel with the most available traction, helping maximise grip without harsh engagement characteristics.

Because the Truetrac relies entirely on gears rather than clutch packs or friction materials, it delivers smooth, quiet and predictable operation without the wear, servicing requirements or performance degradation commonly associated with traditional limited slip differentials. The result is a robust, maintenance-friendly differential that performs consistently in everything from daily-driven vehicles to high-horsepower performance builds.

Genuine Eaton Technology for VE & VF Commodore Applications

Manufactured by Harrop as Eaton's long-standing performance partner, the genuine Eaton Truetrac® for Holden VE and VF Commodore applications combines Eaton's proven helical gear technology with a range of heavy-duty internal upgrades developed for demanding Australian performance environments.

While many helical gear differential designs are now available on the market, the Harrop Truetrac remains the original and most widely proven design, trusted by enthusiasts, workshops and vehicle manufacturers worldwide. This upgraded VE/VF version has been engineered to deliver increased torque capacity, greater strength and enhanced durability for high-performance street, track-day and competition vehicles.

Key Features

• Genuine Eaton Truetrac® helical gear limited slip differential technology
• 210% stronger gear set for substantially increased torque handling capability
• Larger side and pinion gears for improved load distribution and durability
• Eight-pinion gear design for increased strength and superior torque transfer under load
• Precision-cut side gears for improved gear mesh accuracy and smooth operation
• Fully gear-driven design with no clutch packs, friction materials or wearable components
• Automatic torque biasing for predictable traction and exceptional drivability
• Quiet, maintenance-free operation with proven long-term reliability

Vehicle Applications

Holden Commodore VE & VF range, including HSV variants (excluding Gen-F GTS models).