 In its earliest incarnations this transaxle — designed by Richard Ansdale and Harry Mundy incorporating a ZF limited slip differential — proved troublesome and gained itself the derogatorily punning nickname ""queerbox"".However, in 1957 Chapman had hired Keith Duckworth (later to find fame as one half of the founders of Cosworth, and father of the Cosworth DFV) as a gearbox engineer who made significant improvements to its design.By the time that the Lotus unit found its way into the 16 it was a more reliable and less troublesome system.