I have a 98 2wd 3.0 with a manual Mazda M50D-R1 trans with 203,000 miles. I have a whine in 3rd and 5th gear, the faster I go the louder and more high pitched the whine. I checked my trans fluid and its full, my clutch is going out so I plan to change it this weekend, I don't know if the whine is transmission or clutch let me know if any one has any ideas.