The series was further hit when the boat experienced engine trouble and required a new gearbox but the problem was ultimately solved.

It was mated to a new 5-speed gearbox.

The engine feeds a new hydraulic gearbox with 4 forward gears and 1 reverse gear.

The front brakes became discs and from 1964 it got a new gearbox with synchromesh on first gear.

The C21 also featured a new gearbox which was more compact and lightweight than its predecessor.

In the Z4 sDrive35i, the new 7-speed double-clutch gearbox is used.

A new 6-speed gearbox built by X-Trac was part of the package, replacing the previous 5-speed.

The new gearbox, which uses software developed for Safrane makes for even greater comfort of use.

The new car also had higher equipment levels as well a new gearbox, cooling system and front disc brakes.

Power comes from a twin-turbo engine making 563bhp, with a new eight-speed automatic gearbox.