4t65 problem - no overdrive

Hello all! I recently purchased a 2001 Aurora 3.5, but the overdrive does not want to engage. In "D" at speeds when it is supposed to engage, I hear a dull whine and thats it. Selecting "3" eliminates the whine but no overdrive (of course). The fluid is at the correct level and does not smell burnt. The tranny shifts perfectly - its responsive and smooth. Im thinking torque converter is not locking up and might need replacement. Any ideas?

i had that with my 97 classic but I went to a transmission place and they said my Drive was out, and cost 1200 to fix or get a new one, so I got one with 50k on it and had it swapped and man I dont knowwhat to do there is so many probs going on with my car I haven't drove it in two weeks since its been in the shop

NOT good...

vehicle speed sensor, the tranny place just found out located on the tranny not on the wheels.