Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,143 pages of information and 233,681 images on early companies, their products and the people who designed and built them.
of Lythalls Lane, Coventry.
1951 Private company: Self-Changing Gear Co. Maker of Wilson Gearboxes (see advert)
1952 Leyland Motors acquired (an interest) in the company, which owned the patents for the pre-selective type of epicyclic gearbox which Leyland had fitted to the RTL & RTW Titans it sold to London Transport. The company was working on a new type of direct-acting epicyclic gearbox at the time of the Leyland takeover.
1953 The new gearbox was announced as the Pneumocyclic.
1959 Leyland Motors increased its investment in the company
1961 Gear box and transmission equipment manufacturers. 570 employees.
1978 Maker of heavy duty transmissions; part of BL Commercial Vehicles
1982 Trackpower Transmissions, David Brown Gear Industries and Self-Changing Gears formed a major export sales alliance for Britain's two leading armoured fighting vehicle transmission manufacturers.