hawthorne90250

Hi
In the last few weeks when i put my truck into or out of drive i get a loud whine for about 5 secs which appears to be coming from the T/C. It drives fine and has no noise when driving. its and E40D and had full oil replaced about 2,000 miles ago and is currently serviced right. T/C,Pump? is this the end of the tranny? should i stop driving it?
Thanks