Engineered for high horsepower/high torque engines, IMCO SCX upper & 1400 lower. No transmission needed. Cone clutch shifts internally. Fits Bravo HD gimbal with helmet change. Larger net-forged, 1 piece gears and oversized bearings. Larger clutch. Internal water cooling with built-in drive shower. Giant 5 quart oil capacity. 3 gear ratios available 1:25, 1:34, 1:50. 2 prop shafts available 1 7/16" or Mercury Racing #6 Can be ordered with SC Lower.