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Other cars used a different ratio unit, notably the Standard Vanguard at 28%, whose serial number begins 28/. In the case of the TR 'A' type this is 22/. The reduction ratio is signified by the serial number prefix of the Laycock unit. Overdrive provides a 22% reduction ratio to the engine speed for a given road speed when engaged. The only exception to the rule is for the overdrive unit originally fitted to TR2s up to TS5979, which operates in 4th gear only. Range Rover Sport 元20 Heating & VentilationĪn overdrive conversion is among the most useful The ‘A’ Type overdrive unit that was fitted as an option as a rule operates in 2nd, 3rd and 4th gears.
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