Possible that my rearend is going??

Back it up on ramps, and check for ring/pinion lash, by putting the car in neutral(with the front wheels chocked, heh) and rotating the driveshaft back and forth. A small amount of freeplay is normal, but excessive lash indicates wear.
If you jack up the rear tires, you might also be able to feel any grinding, clicking, or other weird noises when you turn the driveshaft by hand. Lower the car so the tires are 2" from the ground, and use a large prybar to wiggle each tire up and down to check for axle bearing play. (Although, usually when an axle bearing gets loose, the seal also leaks gear oil onto the brake backing plate.)

Also, have you checked the rearend gear oil level?

I agree