It is important that both the operator and vehicle manufacturer accurately analyze the operational demands of different types of commercial vehicles. In order to insure satisfactory and efficient engine performance, each individual component comprising the vehicle power train must be compatible with the other. Several of the factors involved in the proper selection of such components as the engine, transmission, rear axle, and brakes are discussed in terms of the type of service required. Some of these components must be selected on the basis of experience gained either in a given fleet or similar fleets in the area where operation is intended.
