DRIVING - Up or Down Shifting For Kenworth Vehicle with Shift Assist NOTE Up or Down Shifting Multiple gear upshifts and downshifts may be allowed when the up/downshift request procedure is performed multiple times (Each request equals one gear change request). 2 The transmission may also deny a shift while ascending or descending grades if the load of the vehicle and grade of the terrain in combination with the drivetrain ratio and engine torque will fall outside of the acceptable range to perform a shift. If the shift is denied it will sound a tone.
For Peterbilt Vehicles with Shift Assist When in the Manual mode, the transmission gears can be manually selected by pushing or pulling on the lever. Pushing the lever forward will down shift. Pushing and holding the lever forward will engage the LOW gear range. Pulling the lever towards the driver will upshift the transmission. Some vehicles may have a feature that prompts the operator to shift for optimal fuel economy. If the prompt appears in the instrument cluster, use the manual gear selector lever to change gears. Y53-1272-1B1 (08/17) 15