So we took the BS to the dealer, and they agreed that the TSB was the problem-however the new hose is not available and has no ETA. Deciding to be the cautious type I had them change the oil in the rear drive unit, the tech described it as "gross". The OK news was that our warranty expired 3,375...
It took 3 visits and me documenting the actual amount of coolant I was replacing before the shop admitted there was a problem and replaced it under warranty.
If you are still under warranty and your vehicle is in the VIN range you really need to get this done. We are 3k on the wrong side of the warranty and the estimate came in at $582 out the door, and that's if the RDU is still servicable.
This sounds like the problem we just noticed. Right before a trip to Detroit and back, a 700 mile trip. The delaership guy just said it should be safe to drive and it's not like the rear differential gets much use in summer driving,, no more off roading until it's done though!
To clarify-at low...