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Salisbury Transmission of Witton, Birmingham, and Bridgwater.
of Ward End, Birmingham
1938 Private company, subsidiary of Birfield Industries
1939 Name changed.
c. 1939 Salisbury Transmission was formed as a subsidiary of Hardy Spicer and Co to make hypoid rear axles for motor cars but production was delayed by start of WWII; the Salisbury Axle was made by Spicer Corporation in USA which would be valuable experience when production started which was expected after WWII.
WWII: carried out government contracts up to 1943.
1952 Name changed.
1961 Engineers, manufacturing motor vehicle rear axles. 580 employees. 
1973 Part of GKN Transmission Division