In Class 8 on-highway vehicles, drivetrain specifications have a significant impact on fuel economy and on driveability, which leads to driver acceptance and retention. To help fleet managers take into account important factors when making drivetrain component choices, ArvinMeritor, Eaton and Dana offer a wealth of helpful advice. For proper drivetrain component specification, know the truck's purpose and application, including desired road speeds and routes. Specifications that should be considered include transmission overall gear ratio and transmission step size. The number of gears and step size should be selected to keep the engine operating in its best fuel efficiency area below cruise speeds. Drive axle specifications dictate where the engine will operate during cruise conditions, and should be selected to allow for good fuel efficiency at the road speed and load where the vehicle will spend most of its time.
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