2021 Peterbilt 337 Cab and Chassis Now Available for Sale! This LOW MILE 2021 337 is powered by a 220hp PX7 Engine and Paired with an Allision 2500RDS Automatic Transmission! This truck only has 144k Miles on it and will be coming with a DOT Inspection; Full PM Service as well as an Interior and Exterior Detail. Vehicle specifications; options; mileage; and availability are subject to change. While every effort is made to ensure accuracy all information should be verified with a sales professional prior to purchase.