Noise driving me insane

[Hybryd40]

Okay guys
I just bought a new 2024 Rubicon JLU with the XR package. Came with BF Goodrich tires in metric. Equivalent to a 35 inch.
The issue I am having is I hear a low harmonic low bass sounding noise which sounds like it is coming from rear of vehicle. The noise does change with road type and speed.
Tires came from dealer set to 40. I changed to door sticker which is 37 and even chalked tested down to 31 psi. No real change.
Took back to dealer today and had them rotate tires and rebalance them again. Check out the rear end for noise, metal shavings and proper fill. Checked out good.
Drove home and same issue. Jeep had 54 miles on it when bought and now just over 700.
Jeep was a 2024 and sitting on dealers lot for almost 10 months so it sat through a summer and a winter here in the Midwest. I do not think noise is because of flat spots. I do not feel any vibration in steering wheel.
I have had off road vehicles most of my life and have had AT and MT tires from size 32 to 44 but have not been owner of a jeep for about 35 years now.
Could this be because a new stiff suspension that needs broken in? Could the rubber in the tires have become hard? Is it just jeep thing and I just have to put up with it?
My next plan of attack was to see if the dealer is capability to road force tires. And maybe pull tires off another Jeep in the lot and confirm if it’s the tires or another issue.
Anyone else have any similar issues or suggestions to help a frustrated man out Greatly appreciated

Sponsored

 

[JINO]

I notice most people eventually go to 25-28 psi in their tires.
For me, it's comfy, drives straight, no fighting steering wheel anymore. Fuel consumption goes up slightly.

 

[kah.mun.rah]

if you are certain that it is coming from the rear, maybe have the rear drive shaft checked to see if it is balanced.

 

[JL ME]

Go and test drive another jeep same make, model and year to compare.
I have a 2021 Willys with M/T's on it and it hums from every direction!

 

[Hybryd40]

I should have stated in original post that it is a harmonic noise that comes and goes while driving and is not constant.

 

[Hybryd40]

Go and test drive another jeep same make, model and year to compare.
I have a 2021 Willys with M/T's on it and it hums from every direction!

I do believe that there is another XR not to far from me. I will do that today and report back.

 

[NWJeepr]

What else have you done to try to isolate the source? Might try upshifting a gear or two while it's happening to see if that changes it.

Are any windows down, or do you have freedom panels out, top off? Wind buffeting can cause a similar noise.

Does the noise change with the type of road surface (concrete, asphalt, dirt)?

 

[Hybryd40]

What else have you done to try to isolate the source? Might try upshifting a gear or two while it's happening to see if that changes it.

Are any windows down, or do you have freedom panels out, top off? Wind buffeting can cause a similar noise.

Windows up and panels in. Noise does not change but can lessen on different surfaces. New asphalt road being the best or concrete at a higher speed.
Already tried shifting to different gears and no difference. I’m really thinking tires as the issue. Maybe a road force balance would solve issue

Does the noise change with the type of road surface (concrete, asphalt, dirt)?

 

[jadmt]

maybe it is the rear diff...been a few reports of that happening on new XR's...I think @alphawolff had that issue.

 

[Barney392]

Okay guys
I just bought a new 2024 Rubicon JLU with the XR package. Came with BF Goodrich tires in metric. Equivalent to a 35 inch.
The issue I am having is I hear a low harmonic low bass sounding noise which sounds like it is coming from rear of vehicle. The noise does change with road type and speed.
Tires came from dealer set to 40. I changed to door sticker which is 37 and even chalked tested down to 31 psi. No real change.
Took back to dealer today and had them rotate tires and rebalance them again. Check out the rear end for noise, metal shavings and proper fill. Checked out good.
Drove home and same issue. Jeep had 54 miles on it when bought and now just over 700.
Jeep was a 2024 and sitting on dealers lot for almost 10 months so it sat through a summer and a winter here in the Midwest. I do not think noise is because of flat spots. I do not feel any vibration in steering wheel.
I have had off road vehicles most of my life and have had AT and MT tires from size 32 to 44 but have not been owner of a jeep for about 35 years now.
Could this be because a new stiff suspension that needs broken in? Could the rubber in the tires have become hard? Is it just jeep thing and I just have to put up with it?
My next plan of attack was to see if the dealer is capability to road force tires. And maybe pull tires off another Jeep in the lot and confirm if it’s the tires or another issue.
Anyone else have any similar issues or suggestions to help a frustrated man out Greatly appreciated

Are you sure it's not the MDS? Drives some folks nuts, others not so much. Also have heard a number of folks that think the 2024 is much worse than previous years for some reason.

 

[Barney392]

Are you sure it's not the MDS? Drives some folks nuts, others not so much. Also have heard a number of folks that think the 2024 is much worse than previous years for some reason.

Sorry. For some reason I thought you had a 392. Ignore my response.

 

[alphawolff]

maybe it is the rear diff...been a few reports of that happening on new XR's...I think @alphawolff had that issue.

Mine was singing under decel. The unit I replaced it with did the same thing. My 2025 also does the same thing.

I think it's just typical of 4.88 units

 

[Ratbert]

Mine was singing under decel. The unit I replaced it with did the same thing. My 2025 also does the same thing.

I think it's just typical of 4.88 units

My rear 4.63s did that after "using them for their intended purpose". Repeated a few times with subsequent replacements until AEV finally replaced front and rears with 4.56s. Now there's a slight noise when decelerating, which hopefully won't get worse after "using them for their intended purpose".

 

[Hybryd40]

Quick update
I drove another XR unlimited last week and it had same noise. Not sure that made me feel any better or not Anyway, I also took my Jeep to my buddy at Discount Tire and he road forced all 4 tires and one was out of round. Max spec out is 35 and closest they could get was 48 and 46. They ordered me a new tire.
So we balanced the spare and installed while waiting tire replacement. Unfortunately noise is still there but it could be slightly better. Can’t really tell and bad one was on the front and noise seemed to be rear.
So as far as the rear axle or diff. There were and there is a TSB out on some XR have right rear axle noise. That TSB is for dates before my build and I don’t have those described noises.
So anyway, thank you and at this time I will just consider it as normal.

Sponsored