1984 - 1996 Corvette: Parasitic Driveline Loss on a Dynamometer 487 July 24, 2014 Engine - Drivetrain, General Topics | GM Press Releases 323 As per GM Powertrain: 16%......ZF6 15%......4+3 17%......700R Automatic 15%......Tremac 6-speed Manual 18%......Getrag Automatic