What could cause a high-pitched whine in the transmission when in third gear?

[AddisonS]

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[Jonathan.D]

I’ve been noticing a faint, high-pitched whine from my car’s transmission that only happens when I’m accelerating in third gear. It’s not the engine, and it goes away if I shift up or let off the throttle, which has me worried it’s an early sign of something internal wearing out.

[Frank_T]

I had a similar thing with my car a while back, a faint high pitched whine that showed up only when the transmission was in a certain gear and I was accelerating in third.

[David84]

I ended up taking it to a shop after a few days and they couldn't reproduce it on the road or on a lift, which left me more worried.

[Charles_S]

Could be a bearing or gear mesh, or the torque converter, not sure.

[NicholasHL]

It did worry me, but in my case it never got louder and eventually faded away after a few weeks.

[Savannah_S]

Sometimes I wondered if it was something loose or a heat shield vibrating, and I poked around a bit but nothing lined up.

[AmeliaSR]

Do you think this is the real problem or could something else be making the noise?