Ok, well I took it to a shop anyways because I don't have the time right now to fix it myself. I had them change the u-joints and flush the rearend (didn't mess with the front end because 4X4 hasn't worked in a while). Anyway, they claimed the u-joints were fine but suggested I have the driveshaft balanced. However, they would have to remove the flanges to balance the driveshaft and this in turn would cause them to lose the u-joint and they would have to replace them. Since I already was planning on having this done (150,000 miles), I said go for it. Well, it turns out the axle was bent and they couldn't balance it. So, they had to strighten the driveshaft before they could balance it. All in all, it cost me $212 for rearend flush, driveshaft straightening, balancing, and u-joint replacement. They also repacked the slip yoke and I now longer have that annoying shutter coming to a stop and pulling away from a stop.
However, he did tell me that the vibration that I have on the highway is wheel bearings. The vibration is better (no longer feel it in my seat and the gas pedal), but it is still there and feels like it is in the front end. Now, I have the good old PVH ('99 4X4). What are your reccomendations for repairing the wheel bearings? I guess I'll have to get new hubs (sealed bearings), but should I also make and adjustment to the PVH while I'm at it. I haven't had 4WD in a couple of years, but I haven't dug into it to determine to root of the cause (shift motor or PVH). Any suggestions on where to start. Thanks!