1990 lincoln town car transmission whine

What is your question?

our 1990 Lincoln town car has had a trans whine for about 6 months now, and it whines in all gears, even in Park and neutral. It goes away slightly in 3rd gear and in overdrive, you can faintly hear it. The fluid is fine and at the full mark, and the transmission seems like its working fine, but it sometimes takes 5 or more seconds for it to shift into drive or reverse. When it rains, the whine disappears completely and comes back after the rain stops. Usually the whine slowly goes away as the engine warms up, but its still there and when accelerating in Reverse, 1st, and 2nd, you can hear it and in 3rd and overdrive, the whine isn't there at all. In park and neutral, the whine is there, but its not as loud as it is when the engine first starts

What makes this problem better or worse?

Its worse when it first starts

How long has your 1990 Lincoln Town Car had this problem?

Ive had the problem for about 5 months