Allison 4000 Series transmission available on CARB-compliant PACCAR MX-13 engine
On July 29, Allison Transmission announced the 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. The Allison 4000 Series is the only fully automatic transmission available with the MX-13 eng