Harrop Diff Hat M86 BF FG and FGX

The Harrop Diff Hat M86 BF and FG Falcon is a great step forward from the factory M86 diff hat. This diff hat is cast alloy and is custom machined.

This diff hat will fit  BF  FG and FGX G6E, XR6 Turbo, XR8 , GS, GT ,GTP F6 and F6E in sedan format only.

This will not fit BF FG ute or any BA Falcon.

The M86 diff hat by Harrop is engineered to increase structural strength and reinforce the rear mont area that attaches to the diff cradle bush.

Having a look at the rear of the diff hat you will notice the alloy casting has a steel insert cast into the hat to reinforce the diff bush bolt a common failure area.

The Harrop diff hat has also an increased oil capacity for differential longevity.

The hat is also complemented with extra alloy fins to enhance cooling of the diff oil , gears and bearings. This will significantly lower gear oil temp.

key features:

  • Cover sand cast from 601-T6 aluminium
  • 4140 Chromoly M16 Thread insert
  • CNC machined
  • Leak tested
  • Improves durability of the rear bush to diff hat connection
  • Improve heat dissipation
  • Increases oil capacity
  • Enables oil cooler to be installed
  • Improves diff housing stiffness
  • Designed & manufactured in Australia by Harrop Engineering


  • All three of the OEM rubber diff mounting bushes must be replaced with polyurethane type performance bush. In a performance application, the OE rubber bushes are over compliant and can result in the driveline components coming into contact with the rear cradle and bodywork.


If you have any questions just ask Here

link to Harrop Engineering Here