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I'm assuming you mean "vocational" trucks. They can be either manual or automatic... some applications more or less demand an automatic for all the stop-and-go driving they do, such as garbage trucks. Others, the owner will weigh the pros and cons of each, and decide what they think is best.In these applications, they'll typically use the Allison transmissions, which are true automatics, rather than the autoshift transmissions used in OTR trucks.

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