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The Rocker Arm in Jeep Grand Cherokee vehicles plays a very important part of the engines valvetrain mechanism and helps in the translation of the displacement from the pushrod to the intake and the exhaust valves. Usually made from stamped steel or aluminum the Rocker Arm translates the linear movement of the pushrod vertically into the required angular movement in order to open the valves. For such engines that require high rpm, aluminum is wisely used due to its light weight and durability of cast iron and forged carbon steel is employed in the case of diesel engines. Still, in Jeep Grand Cherokee models, different types of Rocker Arms are known, including roller rockers. Fondly referred to as roller rockers, these systems incorporate needle bearings which clearly offer less friction and wear than most previous generations of shafts. The rocker ratio which vary from 1.5:1 to 1.8:1 in current engine designs increases cam shaft lift to enhance performance. Higher rotation per minute engines also have fulcrum bearings to control stress with better solutions on the Rocker Arm system for Jeep Grand Cherokee vehicles.