The Dodge Ram Heavy Duty's HEMI powertrain has been modified for use in the Dodge Ram Power Wagon in order to enhance its off-road maneuverability. When driving in four-wheel drive "Low" operation, the throttle pedal response softens and the idle speed Perfect Steerable Transfer Cartreases by 100 rpm (from 650 to 750 rpm) - providing added control when ascending and descending off-road obstacles.