I have the same problem dude but mines an auto. It only does it in overdrive at low speeds like if i hold it at 1800 it will do the whining sound. But if i let off the gas it will stop. No clue what it is.

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2003 Silver Cobra
For sale!
New motor(700 miles) and tranny/clutch(5000 miles).
All warranties for both, drives awesome, can sell stock or with mods to make 460rwhp and 501tq which= 11.70@119
pm for details.
Vid on old combo:
http://video.google.com/videoplay?do...80667909531212