Jensen FF Mk I

Jensen FF Mk I

The Jensen FF (Ferguson Formula) was one of the most technologically significant cars of the 20th century. Outwardly nearly identical to the Jensen Interceptor — sharing its stunning Vignale-designed body — the FF concealed two revolutionary technologies beneath its skin. First, it was the world's first production car equipped with permanent four-wheel drive, using the Ferguson Formula system developed by Harry Ferguson Research. The system used a central transfer case with a viscous coupling that continuously distributed torque between front and rear axles, providing exceptional traction in all conditions. Second, the FF was the first production car fitted with anti-lock brakes, using the Dunlop Maxaret system originally developed for aircraft. These two technologies, now standard on virtually every modern car, appeared in the Jensen FF a full 14 years before the Audi Quattro popularized AWD and decades before ABS became commonplace. The FF was identifiable from the standard Interceptor by its slightly longer wheelbase, a subtle extra crease in the front fender, and twin fuel fillers. Only 320 examples were built, making it far rarer than the Interceptor and increasingly recognized as a landmark automobile.