Rover SD1 Gearbox Unit (5 Speed)
Manual Gearbox Identification
There are two Manual gearboxes fitted to the SDI range- a 4-speed and a 5-speed. We have concentrated here on the 5-speed version because of the rarity of 4-speed models. However, as the 4-speed is essentially a 5-speed with fewer internals, it would be a simple matter to fit a 5-speed 'box in place of a 4-speed.
There were a number of changes affecting gearbox internals over the years and many parts are not interchangeable. Therefore, it is important to identify your gearbox by the number stamped on the left hand side - the vital figure being the suffix A, B, C or D.
Gearbox Oil
Early 4 & 5 speed models used SAE75W oil. From approximately 1980 onwards, Rover used automatic gearbox oil (ATF) in the manual gearbox, to help improve gear selection from cold. Our reconditioned 5-speed gearboxes use ATF. The oil capacity is 1.5 litres.