The ultimate differential upgrade for those high horsepower IRS Commodores. The Harrop 9" IRS diff conversion utilises all standard 9" differential internals and can be custom assembled depending on ratio and carrier requirements.

Features
- Direct bolt up replacement
- Suits VR through pre-VE Commodore IRS
- 31 spline output shafts
- Uses standard mountings
- Oil cooler ports can be fitted if required
- Compatible with most 9" accessories
- Minor exhaust modifications may be required