Hey Mike, did I send you a copy of the latest TSB for the driveshaft? I sent it to someone; I thought it was you. If not, I can send you a copy...
Once you get the driveshaft fixed, you might add a set of James Duff short traction bars. They eliminate axle wind-up, which is the root cause of the driveshaft shudder. According to what I had read on RF a long time ago, axle wind-up causes a near-binding condition in the rear U-joint, which is transfered up the driveshaft to the slip yoke.
Once you get the slip yoke fixed, install a set of JD traction bars and you should be set.
Here's a little more info, along with my less-than-favorable service experience with the dealer: http://www.ranger-forums.com/forum2/...ght=driveshaft