911 C4S comes standard with a six-speed manual transmission, which delivers power to the rear wheels directly and to the front wheels via a viscous coupling. Gearing is tall but the engine's flexibility allows for care-free first-gear take-offs, and the near-1:1 fifth gear means sixth is still the only overdriven gear. Those who pay extra for the "Tiptronic S" automatic model get a five-speed semi-auto transmission with steering wheel-mounted gearchange buttons, which are the only means of changing ratios manually in the absence of a manual shift gate. Fourth gear is 1:1 in the auto, while its final drive ratio is also slightly taller than in the manual at 3.37 versus 3.44 respectively.