Does sound like U-Joints but...without rust dust??? I would to the old heat test. Take for drive then climb under and feel around on the vital parts and look for anything hot to touch. If somthing is that wrong you will find it real fast. Shouldn't be anything under there hot unless it's next to exhaust with the exception of the trans. Rears should be warm not hot where you cannot touch them. I do think it is a U-Joint though

 

So how'd it go? Bad news or Worse news?

 

I think i have the same problem your saying. We were changing my brake pads and i brought up the squeak so we rotated the back tires and it sounded like it was coming somewhere because of the drive shaft and it sounded like it was comming from anywhere because the drive shaft can carry sound because its a tube (from what he said). Long story short, we put a bunch of oil on where the drive shaft meets the differential and after driving around a bit it started going away. But now after winter its come back. But i am almost certain the oil fixed the problem even though it only fixed it for a little. So hopefully you get an answer that i can use to totally fix my problem. ....

 

It was the U-joint, the back one on the driveshaft. So good news A 70 dollar fix total and I was in and out and back on the road in just over about an hour and a half with waiting for the u-joint to come in.

 

Good to hear it is fixed...