Thread: GTP Tranny Noise, Need Help

I always say it doesn't hurt to do a tranny service. A constant bearing noise is generally going to show up in the pan, and it doesn't hurt to break the filter open if you see nothing in their. You are usually going to see signs of failure in the pan on a 4t65e in the pan if you have a bearing failure. I have had pump bearings go bad and show no signs of failure, But I'm yet to see this happen on a 4t65 yet. Can you make the noise happen with the car in drive foot on the brake and e brake on and you rev it up to do a stall test? Don't do this for more than 10 seconds though.

I have tried a stall test and the noise is not present.
The pitch of the noise may get a little more quiet at 75 MPH compared to 20-40 MPH, but I think that the road noise is starting to cover it up. And it doesn't make any difference if I turn left or right it sounds the same. The noise reminds me of the sound of a bad tire, but I know that is not the problem because I rotated my tires recently.

The pitch of the noise stays the same, it is hard to explain with words but as the vehicle speed increases the noise cycles faster, and it is a low pitch sound. The wheel bearings were new.

The noise turned out to be a wheel bearing going out. I wouldn't have thought that that was the problem since I replaced them recently, but at least it wasn't the transmission.