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Discussion Starter #1
I"ll post this video here, i'll try to describe what's going on.

First off, issue is more noticeable when the temperature is colder out say 10c and below.

When accelerating with light pressure on the gas pedal starting around 20kms/h and up to about 60kms/h there is a clunking/knocking sound. Sounds like someone is shaking marbles around in a jar. it is related to something in the drivetrain as the faster I go the faster in sequence the noise gets "faster"

at speeds higher than about 60kms/h its more of a hum, but instantly goes away when I let off the gas.

2012 Jeep Compass FDII Possible PTU Noise - YouTube

From limited reading online it sounds like it could be bad bearing in the PTU, but I'm also thinking possible cv axle related. Haven't taking in to the dealership yet.
 

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Discussion Starter #3
Yeah windshield cracked last year after a stone chip that I never got filled in. The worst part about this problem is that it happens most of the time but not all the time. I'm going to wait until It either fails catastrophically and needs to be fixed. Or gets worse.
 

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Could be a bad bearing but not in the transmission. Have you tried dropping it into Neutral and see if it goes away and/or if your rev slight while in neutral and still rolling if its there and changes with the increased RPM's its not the tranny.

If you still in your warranty I would have it checked, at least its documented even if they cannot find the source the first time.
 

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Discussion Starter #5
I hope its warranty, I'm just hesitant to take it in because of my lift, my dealership isn't that mod friendly, although they would have to prove that my lift caused the issue.

The noise is speed related not tied to engine RPM. As an example I have a FDII so I have low range I can drive in low range and the sound starts at around the same speed and increases at the same rate based on speed, it isn't rpm depended, so at least based on that it shouldn't be transmission engine. It only happens when I'm trying to accelerate .

I did take some videos before under my compass, and I though there was a lot of movement of the rear diff and driveshaft, I could possibly have a lose or broken mount somewhere, that the force of me accelerating may cause enough movement for the driveshaft to be contacting something. I did have it up on jackstands a few weeks ago but I don't think that is a good test since everything is hanging free in the air.

Here is a video

2012 Jeep Compass FDII Rear diff/driveshaft Play - YouTube

What has me somewhat puzzled is how the problem become more prominent the colder the ambient temperature gets. Since I live where in about 3 months it will be about -30c who knows how bad it might sound then.
 
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