Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,343 pages of information and 233,846 images on early companies, their products and the people who designed and built them.

Self-Changing Gear Co

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April 1951.
October 1958.

of Lythalls Lane, Coventry.

1928 Self-Changing Gears company founded by Major Walter Gordon Wilson and John Davenport Siddeley

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.[1]

1986 Leyland Vehicles sold the company to Cummins Engine Co[2] but the privatisation was not publicised for some months[3]

1989 Cummins sold the company to United Scientific Holdings which later became Alvis plc

See Also


Sources of Information

  1. The Engineer 1982/06/17
  2. The Times April 22, 1986
  3. The Times, November 06, 1986