It is an unusual type of automatic transmission as it has an entirely step – less gear changing system. If the belt was in succession near the centre of the forward pulley and the outer surface of the rear pulley, the car might be in a low gear; vice – versa is also plausible and then the car might be in a higher gear. Variomatic transmission was the first commercially successful continuously variable transmission (CVT) developed (as oppose by shifting between separate gears). Theoretically, it always produces the most favorable torque. Aforementioned, the variomatic was brought in by DAF in 1958, as well as bringing an automatic gear box in the Netherlands for the first time. It was introduced on the DAF 600. It consists of a "V" shaped drive belt and two pulleys, each with two cones, and has an effective diameter which can be changed so that the "V" belt runs closer to the spindle or closer to the rim, depending on the distance between the cones. These are coordinated so that the belt always stays at the same optimal tension. Taking the fact the engine runs most of the time in its best fuel economic speed into account, the fuel consumption of this car [DAF 600] was at accepted level, although the fuel efficiency of any mechanical CVT has undergone changes from about 70 to 75% today [which was bettered by Bosch].
As the system does not have different gears, but one gear, which is continuously shifting, and a separate reverse mode (counterpart of reverse gear), the gear fine in reverse as well, giving it the attractive side effect that one can drive backwards as fast as forwards. Consequently, in the previous Dutch annual backward driving world championship, the DAFs had to be put in a different competition as no other car could keep up. Therefore, these very cheap and simple cars were the formula one of this competition.