Gradall’s new Series IV highway-speed wheeled undercarriages introduce a new high-visibility color scheme as well as AutoDrive, combining the benefits of a six-speed Allison automatic transmission and a new Cushman transfer case. Now it's easier then ever to drive a Gradall at speeds up to 60 mph and then reposition the carrier on jobsites from the upperstructure cab. Each of the models also has a new Mercedes Tier IVi engine.