Peterbilt will make powertrains with a TX-12 Pro automated transmission and Paccar MX-13 engine combination an option available to buyers of its 579, 567 and 589 tractors, the Paccar unit said ...

Peterbilt is now offering the Paccar TX-12 Pro automated transmission with the Paccar MX-13 engine in the Models 579, 567 and 589. The company says ... including dump and tanker. (Photo: Paccar) “The ...