What is the fluid capacity of a GM 8.6 rear end?

The fluid capacity of a GM 8.6 rear end is typically around 2.5 to 3 quarts, depending on the specific application and whether the unit has a cover or is filled to the plug level. It's important to check the manufacturer's specifications for precise measurements, as variations can occur based on the model year and any modifications made. Always use the recommended type of gear oil for optimal performance.