and bearing for the factory 2 piece DS. If you do this make replacement (or if a mechanic shop does it) make sure you INDEX MARK the DS pieces to the CMB and to the rear differential yoke so that all goes back together exact as it wes thus eliminating any vibrations. Also note the position of the CMB spacers at the attachment of same to the frame. These are spacers not washers and they set the height of the CMB. There is a left right adjustment at this location so mark where it was.
Also consider replacing the transmission isolater mount that controls the tranny height and DS angle and is a vib damper of the rear of the tranny. With age they sag and wear the u joints and the CMB unit.
If you replace the DS with a 1 piece it will never be as vib free as the 2 piece.