APL's mark III automatic
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• The Mark III automatic transmission unit introduced by Automotive Products Ltd. at the Motor Show can be matched with any engine up to 2.5 litre capacity with a maximum torque up to 150 lb. ft. The design is similar to the transmission developed for BMC transverse-engined cars and the new model is being offered at the moment for car use only.
As compared with the Mark II transmission used by BMC in small cars, the Mark III has important internal changes which are part of the reason for the substantial increase in torque capacity from 85 lb. ft. The pair of multi-plate clutches is now positioned ahead of the gear train and the bevel gears in the gear train have been re-arranged. Two sizes of torque convertor are available with the Mark III transmission. The smaller, 8.25in., is suitable for power units with up to 90 lb. ft. torque and the other which has a 9.251n. diameter torus is designed for engines with the maximum permitted torque of 150 lb. ft.
As with the Mark 11, the unit allows either fully-automatic operation or manual selection of intermediate gears and the selector lever has seven positions—P (park), R, N, 1, 2, 3, and D (automatic). The parking lock is a new feature for the Mark III and provision for tow starting is also provided.