Drive shaft moves up and down a little at the pinion attaching point. Been told its a front pinion bearing going and has caused the seal to leak (it is dripping). Can it be the yoke or Companion Flange or is it the Front Pinion bearing. Universal appears not to be loose & movement is rear of the deflector. Is the bearing an easier repair for the new type or one left to the pros? 56 3200 3spd. Tom