The Cima transaxle gearbox is specially designed for Koenigsegg. This 6-speed manual/sequential gearbox is probably the strongest and most reliable transaxle gearbox ever built for a mid-engine car. Cima, the high quality Italian manufacturer, has utilized a long experience from building custom racing gearboxes in the construction of Koenigsegg's transmission system. It is equipped with an internal oil pump for reliable lubrication and a large external Setrab air to oil cooler, which is necessary due to the immense force of the engine. It also features an advanced torque sensitive limited slip differential. The default set final gear ratio is calculated to propel the cars close to 400 km/h at 7300 rpm.

The gearbox is operated manually via the Koenigsegg developed shift mechanism, a clockwork piece of fine mechanics, which allows the gear lever to be mounted on a ball in a socket. This practical and aesthetically attractive device provides accurate feedback to the operator and also alleviates the otherwise necessary gate solution. The mechanism is designed for compactness and low weight, and it is easily adjustable to driver preferences. It also incorporates an electronic anti-theft device.