Well $148.50 later I have low range back.
As I suspected C140 code was present, they basically followed the Star case S1321000016 checks, cleared the codes & said see how that goes
Service department said they contacted Chrysler & if the problem comes back replace the 4WD actuator??? heard that before
that's right I told them!
No commitment that Chrysler will repair at no cost so I will just have to play it by ear.