Peterbilt adds the PACCAR TX-12 Pro automated transmission for Models 579, 567, and 589, for vocational and on-highway use.

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Moving up in the PACCAR line takes us to the MX-11, which is used in Peterbilt model 567 and 579 trucks. This 10.8-liter engine can put out as much as 430 horsepower and 1,650 pound-feet of torque.