Perhaps. Now we need to determine if it's drive shaft speed, or tire/axle speed. This is simple. Does it sound and feel like a heard of pissed off bumble bees? That's high frequency vibration and is indicative of drive shaft and pinion speed.
Or, is it more of a "whomp whomp" like when you get a flat tire and can feel that it's axle and or wheel and tire speed?
If you can make that determination, that will narrow it down a little more.
