so you think no matter if i get the pinion angle dialed in with the 4link i will still MAYBE have a vibration and will therefore benifit from a bearing kit?..........or are you saying putting in a kit is the best way period for our ec trucks?......thanksbcubed said:No matter how much you adjust at the rear of the driveshaft, I think you are still gonna need the carrier bearing .. I've known I needed one, just never gotten around to it yet since my back is a static drop right now.