The dawn of the motorway era necessitated the fitting of a new 948cc (57.9 cu in) variant of the BMC A-Series engine, elevating top speed from 63 mph to 75 mph, and reducing 0-60 mph acceleration from 52.5 secs to 31.3 secs. Driving was further improved by a substantially revised gearbox, which incorporated taller ratios for more relaxed cruising speeds and a remote selector allowing a shorter gear lever and less ponderous gearchange action. This new engine and gearbox was the product of a broader engine policy at BMC, and had been developed for use in a range of their smaller vehicles, including the Austin A35, A40 Farina, and Austin-Healey Sprite/MG Midget, to maximise parts sharing and thus reduce production costs, servicing costs and consumer costs across the model range.