My transmission started doing a whinning noise about 6 months ago. I was driving along and the car felt like it dropped down gear on its own and I started experiencing a whistling whining noise. I thought it was the catalyic converter, I had the it changed and the noise was still there. I took it to

the dealer and they thought it might have been trash in the catalyic that needed to be blown out. WELL IT WASN'T THAT! The noise got worse and worse and transmission went as I driving along on the highway, which could have been dangerous. That was on Tuesday (12/21) and I got it back Thursday (12/23) for $2500.00 (Merrry Christmas to me!).
Get it checked out ASAP!!!