k+dtrans+auto 12/24/2012When you changed your fluid and filter there was likely a grey to black sedement in the bottom of the pan, this would be friction material from the clutchs. Transmission fluid is high in detergent and often will wash down the clutchs to the point that it wont operate any longer. You are looking at a rebuild or replacement.
JD 1/12/2013Have the same issue with my truck. Did you find out anything?