Yup, jacked all four corners up. Tugged on each wheel, then removed the wheel and tugged on the various suspension components. Got zero play in any direction from anything.
Broknindarkagain, was your noise intermittent? Drove the car about 90 miles on Friday and the noise was only apparent for about 5. When looking over the car, I spun each wheel but I couldn't recreate it. I pray its not the diff...know it won't be a cheap repair.