The 1977 Hang Ten 400 was an endurance race for Group C Touring Cars. The race was held on 11 September 1977 at the Sandown Park circuit in Victoria, Australia over a total distance of 400 km. It was Round 8 of the 1977 Australian Touring Car Championship and Round 1 of the 1977 Australian Championship of Makes. Cars competed in four engine capacity classes: * Class A: 3001 to 6000cc * Class B: 2001 to 3000cc * Class C: 1301 to 2000cc * Class D: Up to 1300cc