Control Arm Shaft Kit: Upper 64-72 GM VariousREAD MORE in the DESCRIPTION Section below on LHS: This is the shaft that goes through the upper control arm.. its bolted to the cars frame.. .. the upper control arm pivots off this shaft. It comes with the bushes at both ends and its main shaft and bolts for holding the washer in place that holds the bush into rigid position in the control arm. When the bushes are flogged out.. the upper control arm moves around.. the car shakes and is crook to