Fred Dixon and Tony Rolt had gotten together to consider the possibility of using 4WD in circuit racing, and with Harry Ferguson keen to promote the transmission systems of his Ferguson tractor firm work began on the P99 in 1960.
In the 1950s the McKay family sold out to the newly formed agricultural implement conglomerate Massey Ferguson which was a combination of the Canadian and American interests of Massey Harris, and the British tractor firm of Harry Ferguson.
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Harry Ferguson merged his worldwide companies with Massey-Harris of Toronto in July 1953, three years before TE and TO20 production ended, hence the change of name on the serial plate to 'Massey-Harris-Ferguson'.