Land Rover Series III: the most numerous of them all (1971-1985) The Land Rover Series III was the most numerous Series of all, recognised by its plastic grille and the first all-synchromesh gearbox. A guide to the 88 and 109 inch cars, the engines including the Stage 1 V8, the Lightweight, what to look for when buying, and why it is the most affordable way into a Series Land Rover.