They often have a gear shifter with an automatic clutch. Typically a centrifugal clutch and sprocket. Car 47 did not finish due to clutch and gearbox failure. Float shifting is the process of shifting gears without using the clutch. The synchro ring rotates slightly because of the frictional torque from the cone clutch. The SUV utilises a 6-speed dual clutch automatic transmission. It also received a hydraulic clutch. A simple retarder uses vanes attached to a transmission driveshaft between the clutch and roadwheels. A system of clutch wheels captures power. The cars use a triple plate clutch. This takes the place of a friction clutch in a manual transmission. This includes modifications to the drive motor, feeder and barrel clutch assembly. NISMO produced an upgraded exhaust, a twin-plate clutch, and intercooler system. The transmission was given a heavier-duty, slipper clutch. Gibson was known for hitting clutch home runs.