Road speed related squealing from underneath!
I was driving home, at freeway speed, and there was a single *knock* sound, like I'd driven over a small rock. I looked in the mirrors and the road behind me was clean. 400 yards later I took my exit and as I slowed a squealing sound started. I stopped about a quarter of a mile later. A quick check under the Jeep showed nothing loose or obviously dragging.
I drove slowly in to a business park they just built, out of traffic down a side road. With all the windows down I drove slowly along, less than walking speed. I got a sound kind of like brake wear indicators. From inside it sounded like something behind to my right was dragging. It is 100% road speed related and sounds like a grinding at moderate speeds.
I jacked it up and took the back wheels off one at a time, starting with the right. Everything looked good on the wheels and brake disks, the dust shields aren't loose or bent.
I set my camera on the kerb and drove past slowly. It sounded more towards the front, unlike the sounds inside. OK, so I tried the fronts. Nothing apparent wrong there.
Now what? Too late to drive to the dealership. So I drove home slowly on surface streets.
I noticed that with the windows down it sounded like the front, but equally noisy on both sides.
Close to home I noticed that slowing for lights made the noise worse.
Accelerating the noise went away.
I live up a steep hill, going up it the noise was almost gone.
At home I dragged the family out to listen. I noticed tha it makes the sound rolling slowly forward in neutral. My daughter crawled under when it was off and couldn't see anything loose.
So... driving very slowly with one of them crouching on either side they heard it as under the center of the vehicle right under the front seats. My daughter says it sounds like it is coming from under the cardboard cover in the middle of the vehicle about under the back of the center console.
Just before i switched off I noticed that with my foot on the brakes shifting between neutral and drive I get the same squeak, but short lived.
So... to me it seems like maybe a transmission or drive shaft issue, maybe a broken mount. And it seems like I probably shouldn't have driven it home.
And if it matters it's a limited diesel with OA2 and rock rails which don't shift.
What do you think?