2011 Escalade Driveline binding

[the blur]

I have a 2011 Escadale. 70,000 miles. 100% OEM stock. Taking off from a light, or stop sign, feels like there is a bind in the rear end, or rear brakes. Then it releases, and the truck drives normally. Very intermittent. Kinda like a limited slip wheel hop - then release, but not quite. Maybe the transfer case sticking ? ???

 

It's a bind, you can definitely feel it. My wife noticed it. Then I confirmed it today.

 

Original owner, never wrecked or smacked. Just started recently.

 

Maybe a caliper hanging, but I doubt it. No brake pad odor. No scorched rotor. I grease the pins annually.

 

Any hints would be great.