Twin pinion gear case.
More gears, less drag - pure propulsion.
There are no shifting clutches in the 557's gearcase. With shifting moved into the ZF transmission, the twin-pinion gearcase is dedicated to VELOCITY. It is designed to do one job, and one job only – maximize hydrodynamic efficiency. A long slender torpedo creates less drag, twin pinions cut geartrain stress by half, a stainless steel rear bearing carrier improves propshaft support, and a longer strut accommodates up to 18" diameter propellers. Dual adjustable water inlets even allow clean water pickup on step-bottom hulls. A serious spec for serious off-shore boating – sometimes less really is more.