I have a 2006 Chevy Malibu Max with automatic transmission, 129,000 miles. It’s got a higher pitched whine that increases as I accelerate between first and second gear and between 2nd and 3rd. I can’t hear once it’s in 3rd gear. It sounds like an RC car or early video game race car sound. I can hear it winding down as I slow down through those gears. It’s also audible when the car is in neutral or park, but not then the brakes are fully applied. I can’t really hear it in reverse.
I bought it used with 65,000 miles on it. I’m not sure what was done before that as far as maintenance/preventative maint. I did get a transmission flush three years ago (sorry, don’t know the mileage at that time). I don’t think this will impact things in any way, but I just changed the spark plugs and wires a few weeks ago.
It has a rough/shuddery idle (but doesn’t feel like it’s goign to stall out) and seems to be riding rougher than usual lately. I feel it more in the seat/overall car vibrations than through the steering wheel.
Any ideas? Transmission Oil Pump? Planetary Gear Set? I was really hoping to not have an expensive repair, but I am fearing the worst.