Harrop Engineering has designed a replacement IRS diff assembly that utilises the components from the popular Chev 12 Bolt diff assemblies. Available with ratio options of 3.08:1 through to 5.46:1. All assemblies are fitted standard with the Eaton TrueTrac differential.

Features
- Direct replacement for  Holden IRS diff assembly
- Utilises standard driveshafts
- Modified tailshaft available to suit
- Suits all aftermarket 12 Bolt diff components
- Supplied standard with Eaton TrueTrac diff
- Optioned with Eaton Posi LSD or Detroit Locker