This gearbox would automatically pre-select first gear when reverse was engaged. On engaging second gear, the gearbox would then pre-select third, and fourth when third was engaged. It would then cycle between third and fourth until another gear was pre-selected manually. Initial versions were produced without any form of clutch, however a centrifugal clutch was soon added to the design. Described by Talbot as the 'Traffic Clutch'. this was a simple device, with two radially swinging shoes (similar to a drum brake).