Drive Train: Light duty trucks use transmission method similar to that of the cars which are either automatic or manual with synchornisers. Heavier trucks however use manual transmission without synchroniser that is less bulky. Crash boxes (transmissions without synchronizers) have a requirement of employing double clutching for every shift, called as floating. Generally North American setups include 9,10,13,15 and 18 speed levels. Semi-automatic or fully automatic transmission system is generally preferred to reduce the fuel consumption. In European market the gears may be of 8, 10 and 12 in case of manual transmission while for automatic transmission it might range anywhere between 5-12 gears. The trucks generally have range shift pattern in the gear system.