Do you have any more of a description of the problem other then a "whistling?" Does it drive normal? Problems shifting?
The 4R70W is a great trans. The only thing that usually kills them when the car is stock is excessive heat. Thats solved with a transmission cooler and changing the fluid every 12-20K miles.
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'97 T-bird LX 4.6L 2V, auto
SVO heads/intake, Vortech T-trim, front mounted intercooler, blower cams, Cobra crank, Manley H-beam rods, JE pistons, Aeromotive fuel system w/ 42# injectors, and much more
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