Holden Monaro (1968–1978): Differential Specifications, Fluid Types, and Capacities

The Holden Monaro, produced between 1968 and 1978, is an iconic Australian muscle car that showcases both style and performance. Across this range, the differential varied depending on the model and drivetrain configuration. Early models such as the HK, HT, and HG series typically featured a standard Salisbury or Banjo differential, while later HQ, HJ, HX, and HZ series models were often equipped with more robust Salisbury differentials, particularly in V8-powered variants. For optimal performance and longevity, the recommended differential fluid is a high-quality hypoid gear oil, typically SAE 80W-90 or 85W-140, depending on driving conditions and load. Always check manufacturer guidance for specific requirements. The fluid capacity generally ranges between 1.5 to 2.5 litres, depending on the model and differential type. Regular maintenance, including fluid checks and changes, is essential to keep your Holden Monaro’s differential operating at peak performance.Importance of Gear Ratiosh