© PACCAR Inc. Kenworth® Allison 4000 Series™ fully automatic transmission is now available with the new CARB low NOx compliant PACCAR MX-13 engine for Kenworth T880 and Peterbilt Model 567 truck models. "Integrating the Allison 4000 Series into vehicles equipped with the CARB-compliant PACCAR MX-13 engine will support efficiency and fuel economy, while still delivering on our promise of reliability and productivity," said Rohan Barua, Vice President, North America Sales, Global Channel and Aftermarket, Alli ...