McLaren M9a 1969
McLaren Racing's Jo Marquart's experimental design employed four-wheel-drive during the 69 season.
The cars used a Cosworth-Ford engine turned back to front driving through to a McLaren-designed 4wd transmission. Despite exhaustive testing the car was raced only once and as with other manufacturers, 4wd projects were abandoned.
Bruce McLaren's team was the last front-running team to produce a 4WD car in 1969, a brand new chassis designed by Jo Marquart and designated the M9A. The car, complete with distinctive "tea tray" rear wing, was completed in time for Derek Bell to use in the British Grand Prix alongside the standard M7s, where he retired with suspension failure. After McLaren himself tested the car he compared driving it to "trying to write your signature with someone constantly jogging your elbow" and the car was never raced again.