PACCAR Axle, 2017 MX engine offering overview: Peterbilt 579 Epiq PACCAR recently made several big announcements. The first was the unveiling of its 40,000-lb. tandem driven axle that will come as standard equipment on Peterbilt’s 579 spec’ed for linehaul applications. The second was the detailing of enhancements made to the 2017 PACCAR MX engine lineup. I rolled down to Denton, Texas, to get behind the wheel, look under the hood and get a first look at the new PACCAR Axle. So call shotgun and climb aboard as we dig into the details of Peterbilt’s latest offerings on this episode of On the Road.