Over Night Axle Wrap?? Rear u-bolts Tampered with???

Ok, this is my first post so be gentle Guy's! I have an 07' double cab, prerunner SR5, V6 off road package 105,000+ moles. Now I have always heard a thump when I release the brake pedal since I bought it with 7 miles on it. I drove it yesterday and it had the same small thump when I release the pedal.. Now today i went to leave and pulling out of my parking spot when i released the brake it was ten times worse! i asked my neighbor to drive " let off the brake, apply the brake" while I looked. To my amazement my entire rear diff axle housing was moving in the same rotation as the tires spin!! I am all the way stock on the suspension, but also have a Psycho neighbor that likes to Key people cars for parking on the street in front of his place!! Any ideas on overnight axle wrap??? Torque specs on u-bolts?? and if it is u-bolts, then whats the process to allign the rear end to it's factory settings??

 

If you can see stuff moving around, it shouldn't be too hard to find out what's loose. Jack up the back of the truck and set it down on jackstands - then wiggle everything and see what moves that shouldn't.

Welcome to TW!