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There are two configurations for a tandem truck... the first - more common in Europe - is known as "single screw". The driveshaft goes to the differential of one axle, and that's the only live axle. In cases such as this, the additional axle is typically a lift axle.

In N. America, tandem trucks normally use a twin screw configuration, where the driveshaft goes to a power divider... that power divider is essentially a differential, and has outputs going to both axles... ergo, both axles have power supplied to them at all times. A lot of people think that the power divider lock engages one of the axles.. this is not true.. it simply locks the outputs so that they always rotate at a matching speed.

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Q: What axle drives a tandem truck?
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