2024 Droning/Vibration Issue

[Deleted member 107602]

Need your collective sage like advice

So I am a big believer it’s a Jeep it’s going to make noises, I’ll see if anything breaks. However, this one is bugging me.

Between 60-70 mph I am getting a dull repetitive droning noise. The best I can describe it is to think of the frequency of a flat tire at 20-30mph but not thumping just an oscillating droning hum. It’s not real loud but definitely noticeable and there is a slight vibration that can be felt through the floorboard. Almost dead on it starts at 60 and goes away at 70 and peaks in the middle.

First thought was front driveshaft, removed it drove it, still there. Drove it for a while, got under felt around axle, transfer case nothing was unusually hot. Tires seem fine and it doesn’t seem to be concentrated to any corner as far as I can tell.

2024 JLU 2.0L 16k miles, XR so factory FAD delete, stock 35”tires, AEV 2.5” lift + track bars, stock rear driveshaft. I did replace the front driveshaft about 700 miles ago with a 1350 due to blown Rzeppa seal. This issue only came up in the last 150 miles.

Logically it would seem something rotating is going into resonance at that speed not engine rpm. But that it’s unchanged with no front driveshaft really stumped me. Also. Its not specific to being under load. Run up to 70 let off the gas and it stays consistent passing back down through the speed range. My focus is on the front axle but maybe I am barking up the wrong tree. I really feel STLA screwed up this front drivetrain for any kind of lift with the FAD delete especially on the 2.0 where the engine transmission angle is so heavily biased downward towards the rear relative to vehicle position but I digress.

Appreciate any ideas on what to chase next.

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[autotragic]

Need your collective sage like advice

So I am a big believer it’s a Jeep it’s going to make noises, I’ll see if anything breaks. However, this one is bugging me.

Between 60-70 mph I am getting a dull repetitive droning noise. The best I can describe it is to think of the frequency of a flat tire at 20-30mph but not thumping just an oscillating droning hum. It’s not real loud but definitely noticeable and there is a slight vibration that can be felt through the floorboard. Almost dead on it starts at 60 and goes away at 70 and peaks in the middle.

First thought was front driveshaft, removed it drove it, still there. Drove it for a while, got under felt around axle, transfer case nothing was unusually hot. Tires seem fine and it doesn’t seem to be concentrated to any corner as far as I can tell.

2024 JLU 2.0L 16k miles, XR so factory FAD delete, stock 35”tires, AEV 2.5” lift + track bars, stock rear driveshaft. I did replace the front driveshaft about 700 miles ago with a 1350 due to blown Rzeppa seal. This issue only came up in the last 150 miles.

Logically it would seem something rotating is going into resonance at that speed not engine rpm. But that it’s unchanged with no front driveshaft really stumped me. Also. Its not specific to being under load. Run up to 70 let off the gas and it stays consistent passing back down through the speed range. My focus is on the front axle but maybe I am barking up the wrong tree. I really feel STLA screwed up this front drivetrain for any kind of lift with the FAD delete especially on the 2.0 where the engine transmission angle is so heavily biased downward towards the rear relative to vehicle position but I digress.

Appreciate any ideas on what to chase next.

It's the tires. Once I got rid of the stock bfgs the sound went away I had the exact sound you're talking about and so have many many others. If you do a search you'll find that there's other threads that talk about this problem.

 

[Deleted member 107602]

It's the tires. Once I got rid of the stock bfgs the sound went away I had the exact sound you're talking about and so have many many others. If you do a search you'll find that there's other threads that talk about this problem.

Thanks, I have searched and seen some of that but I am struggling with that 16k miles rotated 3 times, I checked tread is even across tires and around, run at 33psi. Doesn’t “feel like a tire but I get it. The only potential contributing variable I could come up with that it came on relatively quick is just how cold it’s been and most trips since have been 20 miles or less. If it was coming on slowly I would have thought I would picked up on it when I was screwing with the driveshaft and really paying attention.

Been trying to hold out for 37” KO3 in LR C but maybe I’ll not wait that out. If I go with a heavier tire I planned to go to a 5.13 anyway so if it is the axle I’ll just tear it apart all at once.

 

[autotragic]

Thanks, I have searched and seen some of that but I am struggling with that 16k miles rotated 3 times, I checked tread is even across tires and around, run at 33psi. Doesn’t “feel like a tire but I get it. The only potential contributing variable I could come up with that it came on relatively quick is just how cold it’s been and most trips since have been 20 miles or less. If it was coming on slowly I would have thought I would picked up on it when I was screwing with the driveshaft and really paying attention.

Been trying to hold out for 37” KO3 in LR C but maybe I’ll not wait that out. If I go with a heavier tire I planned to go to a 5.13 anyway so if it is the axle I’ll just tear it apart all at once.

I don't think that it's a treadwear issue or a balancing issue I think it's a tire design issue.

My issue went away completely when I replaced with them with Mickey Thompson tires.

Which is a bonus because not only did it solve the noise problem but I actually have better tires.

 

[Nokones]

I agree, the Mickey's could help resolve the issue.

Usually a driveline vibration issue between 60-70 MPH relates to driveshaft balance, and while under load between 35-45 MPH usually relates to pinion angles. The pinion angles should not exceed more than 2 degrees difference than the driveshaft angles.

In this case, I would correctly check you pinion angles especially the rear, because the front driveshaft and pinion angle should not be a factor since you shouldn't be driving in 4 Hi at 60-70 MPH.

Although, this may not be contributing to your vibration issue, since you lifted your vehicle, you need to ensure that your axles are centered with ghd vehicle.

More than likely, you will need to install adjustable track bars and control arms, and shocks to accommodate the ride height change.

Normally, Lift kits do not include the aforementioned bars and arms. They should because when a vehicle is lifted suspension geometry changes and all kinds of handling/ride problems start popping up.

 

[Deleted member 107602]

I agree, the Mickey's could help resolve the issue.

Usually a driveline vibration issue between 60-70 MPH relates to driveshaft balance, and while under load between 35-45 MPH usually relates to pinion angles. The pinion angles should not exceed more than 2 degrees difference than the driveshaft angles.

In this case, I would correctly check you pinion angles especially the rear, because the front driveshaft and pinion angle should not be a factor since you shouldn't be driving in 4 Hi at 60-70 MPH.

Although, this may not be contributing to your vibration issue, since you lifted your vehicle, you need to ensure that your axles are centered with ghd vehicle.

More than likely, you will need to install adjustable track bars and control arms, and shocks to accommodate the ride height change.

Normally, Lift kits do not include the aforementioned bars and arms. They should because when a vehicle is lifted suspension geometry changes and all kinds of handling/ride problems start popping up.

i appreciate your response. i have adjustable track bars and it is centered.

its unlikely to achieve a bad pinion angle on the rear and the front will never be ideal when lifted by design. I did mention that 2024 XRs had the front axle disconnect deleted from the factory, so the front driveshaft shaft is always spinning, even in 2wd, so it is a problem.

 

[jasonb1980]

My 2024 Wrangler Unlimited Rubicon, bone stock with the KO2's had this exact same vibration.... right around 65 it would vibrate so bad that you simply didn't want to drive at that speed. Balanced the tires to no improvement. Thought it was the front driveshaft, pulled that and no change. I pulled the rear driveshaft and the vibration went away. It seems like the joints on either end of the drive shaft are rough as compared to the one on the front drive shaft. I'm driving around in front wheel drive for a while until i get this fixed!

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