Strange Harmonic or drag

[dfurgeson]

I will try to explain as best as I can. I have about 6k on a 2024 JTR. I drive about 40 miles each way to work all highway every day. Have not done any off roading yet but plan to in the future. Lately on the highway, seems to be predominantly around 60-65 mph and primarily under load I get a strange slow harmonic or pulsation that I can feel more than hear but I am hard of hearing after years of working on jets. Maybe just in my mind or being hypersensitive since it is my first jeep.
It almost feels like a pattern every second or two for a second and maybe a little drag to it.
No lights or indicators of any kind. Is this normal to jeeps?
Thanks for any thoughts.

Sponsored

 

[Lost1wing]

Time to rotate tires! I would start with that and inspect the tires for abnormal ware. Check your tire pressures. Not on my Gladiator, but on my Duramax, my Wranglers and BFG's would give me the symptoms you describe. I run 65psi in front and 80 in the rear and I can hear it. When I run 80 psi in front like the rears, the noise goes away. I saw some light feathering on the Goodyears with factory spec tire pressures. So far zero feathering with the higher pressure in front.

I have heard of dealers putting in 40 psi instead of 37psi. Others run even lower than 37 on the highway. I keep mine at 37psi, even on the trails.

Another thing to look at could be oil levels in the diffs and transfer case.

I have the same type hearing loss. I know the feeling you are describing.

 

[dfurgeson]

Thanks. I did just have the tires rotated but they didn't balance. Did not notice any odd wear patterns. My original thought was possible low differential fluid or transfer case fluid from the factory but haven't checked it yet. I asked the dealership to check the levels when I had them rotate the tires but they balked at doing it so I will do it myself. The only reason I went to them was because I get a couple free rotations. I don't think I will go back as I like to have balancing done also.
I had a Challenger prior to this and when the differential fluid was a little low it would make all kinds of weird noise.
Thanks again Lost1wing, lol, I worked 15's in the AF for 24 years.

 

[bleda2002]

Most likely one tire is slightly out of balance and it was in the rear before. Now its upfront so you will notice it more. I've also noticed the first 750ish miles after a rotation everything feels slightly off as the tires wear in to their new positions and knock off the high spots.

 

[PuddleJumper]

I will try to explain as best as I can. I have about 6k on a 2024 JTR. I drive about 40 miles each way to work all highway every day. Have not done any off roading yet but plan to in the future. Lately on the highway, seems to be predominantly around 60-65 mph and primarily under load I get a strange slow harmonic or pulsation that I can feel more than hear but I am hard of hearing after years of working on jets. Maybe just in my mind or being hypersensitive since it is my first jeep.
It almost feels like a pattern every second or two for a second and maybe a little drag to it.
No lights or indicators of any kind. Is this normal to jeeps?
Thanks for any thoughts.

tire rotation time. every 4-6k.

 

[dfurgeson]

Just an update - Tire rotation and balance complete. Was slightly off but was not the problem. I did notice it improve handling
Next replaced transfer case fluid.
I checked both differentials and they were both low from the factory so I added to where they should be.
Still have the issue and am just second guessing myself and thinking it may just be normal and I'm being hypersensitive coming from cars that were always quieter and smoother. Other than what I described it runs well with no issues. Maybe it is just "a Jeep thing" lol

Sponsored