<div class="section abstract"><div class="htmlview paragraph">IN discussing the transition from torque converter to fluid coupling operation. the author explains that the point where the transition should be made and the performance range that should be favored depends on the type of service required of the vehicle.</div><div class="htmlview paragraph">For example, he says that a good coupling range is important in passenger cars, where a good deal of the operation is at part load, whereas in city buses, maximum torque multiplication is more important to give the high acceleration expected of these heavy vehicles.</div></div>