A powershift shuttle reverser is the most prominent new feature on the Renault 155-54 TZ Tractronic. It provides four speeds, two ranges, three powershift speeds and a new ‘Power Command’ lever under the steering wheel. Here we find out where else Renault has improved its 107kW/145hp tractor and where we feel it still needs improving. Text by Manfred Neunaber, photos by Barry Wyles