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"Day cab" refers to a truck which does not have an attached sleeper berth.

"Twin screw"... on a single axle truck or a tandem axle with only one live axle (more common in Europe than the US), the driveshaft goes from the transmission output straight to the live axle differential. That's what's colloquially known as single screw.

Most tandem axle trucks have both drive axles as live axles, and the driveshaft goes from the transmission output to the power divider (also known as interaxle differential), which in itself is a differential. Power is distributed from the power divider evenly to both axles in normal operation. This is what's known as a twin screw system.

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11y ago

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