Prospector I just went thru all that with my 85 300 SD. I had to drop my entire drive shaft twice because I did not have all the parts I needed the first time. What it was on mine was shaft is connected with 6 bolts front and rear on the front 1 of the bolts loosened up and it elongated the hole in the metal yoke. I bought a used shaft, 2 new flex joints, new u-joint, 2 center bushings, 1 center carrier holder +bearing. Total cost for parts was about $ 150 + and a lot of hrs. labor. You could look up my posting on issue under my u.n. On mine I had to drop pan + exhaust to work on.