Hey Scotty! My 2009 Camry is Making a Weird Hissing Noise in Reverse

2009Camry

I have the 2009 Toyota Camry with the V6 engine, and I recently noticed that it made a hissing noise when it's only in reverse. I'm not sure how long it's been happening, but it's definitely noticeable.
Here's a video of it: https://photos.app.goo.gl/mUUStuZ6HjwTtJWt7

Here's another video showing me shifting gears to prove that it only happens in reverse: https://photos.app.goo.gl/uhQfHfLVC9VJWv1u5

It's kind of hard to hear, so you might have to turn the volume up.

Recently, I have drained and filled the transmission with fresh fluid after replacing the filter with a Beck/Arnley one. I lost about 3.5qts, so I put in 3.5qts and did the sealed transmission temperature check to make sure everything was set.

What I noticed after a week is that the old drain plug was ever so slightly leaking so the transmission pan was damp, so I replaced it with a new OEM one, leak solved. I also put in a bit of fluid in to compensate for any fluid I lost. This is when I began noticing the hissing sound.

I did the transmission temperature check again, and I noticed that the transmission was slightly underfilled (no fluid trickling out), so I filled it up till it was at the right level again (fluid trickling out between 103F-114F). The hissing is still there, and I'm at a loss.

Again, this ONLY happens when in reverse and nothing else. Also, the car has to be warmed up for the noise to occur, which is probably why I never noticed it in the garage as I don't wait for the car to warm up before reversing out for work. I used a car stethoscope and I confirmed that this hissing noise is coming from the transmission.

Sorry for the essay. Can you help me figure out what's wrong?

Comments (2)
No. 1-1
Scotty Kilmer
Scotty Kilmer

Editor

If it's you it's OK I would live with that noise because the only thing you could try would be to change the vent for the automatic transmission. If not that it would be internal wear noise