I have a high pitched whine(not the gear whine) in my 2004 Ranger with the 3. 0 engine and the 5R44E transmission. The whine is primarily in 1st, and 2nd, and some times 3rd. The truck has 60K and I just changed the fluid with MerconV. No other problems and the old fluid was clean and pink. I checked the TSB's and found none for my year but did find one for the same problem with the same transmission, for the 2002 Ranger. The TSB# is 15785. Any ideas what causes this whine and am I headed for big problems or should I let it go? Thanks for any help.