Diff or Wheel bearing noise?

[lasturbo]

The one I am most inclined to purchase also has wheel-bearing-like noise. From about 40mph, I can begin to feel vibration. By 60mph, it is fairly loud. Between 60-65, it annoyingly loud though the harmonics quiet somewhat by 70mph. I could see this being a wheel bearing or differential bearing issue. I also note it's louder when sitting in the back seat.
Gregg

This symptom above for me and my 1999 was the differential. I was lucky to obtain a like new used one from Lisa (VX Crazy) and after installation, synthetic gear oil, and LSD additive, it was good as new.