The Jensen FF was the first production car to use four-wheel drive with a center differential, introduced in 1966.
The British Jensen FF was based on the Interceptor grand tourer and used a Ferguson Formula four-wheel-drive system. Its center differential distributed engine torque between the front and rear axles, allowing the car to use four-wheel drive on normal roads without the driveline binding associated with simpler selectable systems. The FF also included Dunlop Maxaret anti-lock brakes.
The model was expensive and produced in limited numbers, so it did not make four-wheel drive a mass-market feature. Lamborghini later used a related layout in the Espada, while Audi’s Quattro made permanent all-wheel drive famous in rallying and road cars. The Jensen FF’s importance is its early production application of a practical center-differential system.