Truetrac Diff Modified 31 Spline

HARROP | Truetrac Differential 31 Spline HQ -VK shop online

  • 31 spline
  • Smooth operation
  • Performs open until needed
  • Torque Biasing
  • Fully automatic limited slip
Truetrac Diff Modified 31 Spline


The Harrop Truetrac was the first helical gear differential ever introduced into the automotive aftermarket as a Harrop brand. It remains the leading helical gear-type limited slip differential in the industry. The Harrop TrueTrac's proven helical gear design eliminates the need for wearable parts, resulting in maintenance free traction recognized not only for its toughness, but its smooth and quiet operation as well.

Proven design, low cost and effective performance all make the Harrop TrueTrac limited slip differential the ideal choice for a wide variety of vehicle applications both on and off road. No maintenance - Just Traction.


  • Holden Commodore HQ to VK
  • 31 spline applications