The Cotal self-changing gearbox of the 1930s was a manually controlled epicyclic, like the Wilson.

Daimler fluid flywheel and Wilson four-speed preselective self-changing gearbox.

The cross-drive transmissions offered a mechanically-actuated self-changing gearbox, where the ratio selection could be either manual, automatic, or by pre-selection.

Even today older Daimlers and Lanchesters, with their self-changing gearboxes still in perfect working order, provide newcomers with hours of delight and fascination.

A preselector or self-changing gearbox is a type of manual gearbox (US: transmission) used on a variety of vehicles, most commonly in the 1930s.

Power was transmitted to the rear wheels with the usual Daimler fluid flywheel and self-changing gearbox but the final drive was now by spiral bevel.

The unit of engine, fluid flywheel and self-changing gearbox was held at four points on rubber, the two points in front being close together and on the cross member.

In 1928 he invented a self-changing gearbox, and formed Improved Gears Ltd with J D Siddeley to develop the design commercially.

Power was delivered to the wheels by Daimler fluid flywheel and Wilson four-speed preselective self-changing gearbox through a propeller shaft which was open and had mechanical joints.

During 1930 The Daimler Company of Coventry, England began to introduce a transmission system using a fluid coupling and Wilson self-changing gearbox for buses and their flagship cars.

Wilson self-changing gearboxes were available on most subsequent Armstrong Siddeley automobiles, manufactured up to 1960, as well as on Daimler, Lanchester, Talbot, ERA, AC, Invicta and Riley automobiles as well as buses, railcars and marine launches.