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Thanks for the advice. When I left for work today it was about 65 degrees outside AND I let it warm up. Still got a high RPM rev with no "go". gradually dropped into first. Not good.
I have the same situation with my 2005 QC 4.7L AWD, but I think you guys are stressing out over nothing. I had the same symptom to a degree with my 1993 3/4 ton Suburban 4WD. It just takes a little bit to get the fluids warm and flowing. The Suburban has over 150K on it, and is still going strong. I do not perceive this as a problem, but something more akin to letting your geartrain warm up before putting it under a load as in limited slip differentials.