DRIVETRAIN
Transmission: 6-speed manual
Final-drive ratio: 3.44:1, limited slip
Gear, Ratio, Mph/1000 rpm, Max test speed
I, 3.91, 5.6, 40 mph (7200 rpm)
II, 2.32, 9.4, 68 mph (7200 rpm)
III, 1.61, 13.6, 98 mph (7200 rpm)
IV, 1.28, 17.1, 123 mph (7200 rpm)
V, 1.08, 20.2, 146 mph (7200 rpm)
VI, 0.88, 24.8, 179 mph (7200 rpm)

http://www.caranddriver.com/roadtests/8683/porsche-911-carrera-s-page4.html