Droning sound going over 30

[Shane Mckinley]

Ok I've looked through the forums and most of what I see deals with pinion angles ect. Anything dealing with a lift....

Stock. I get the droning sound above about like 30mph

I also have a useless rear view mirror over about 60/65mph

The rear u joints were replaced within the last 6 months. Tires were balanced prior to that

I know others have mentioned repeated need to balance tires on the TJ

Obviously the balance is the first/cheapest thing. Any other ideas?


Sent from my iPhone using Tapatalk

 

[Rob5589]

The obvious would be to check the front shaft. Next would be suspension components. Worn control arm bushings can alter the angles. Good to have the shafts balance checked as well. Check trans/case mount, too.

 

[Chris]

Yeah, although it sounds like a broken record, the usual culprit is improperly balanced tires. Most tire shops just aren't good with balancing the large tires we run on our TJs.

But other than that, I think it always comes down to pinion angles and u-joints. Sometimes it's possible to have a bad unit bearing (though that's usually more of a whine) or a driveshaft that has gone out of balance (more uncommon).

 

[Shane Mckinley]

Acceleration only if that matters

Thought I had it all covered.

I'll get under there tomorrow and check it all


Sent from my iPhone using Tapatalk

 

[Rob5589]

Usually a droning "woom woom woom" is driveline based. Tires are more of a wobble or shaking, often felt in the steering wheel. You could swap tires front to rear and see if it changes.

 

[Chris]

Only on acceleration? Check the front driveshaft to see if it's contacting the edge of the transfer case skid plate at all.

Also, the rear pinion angle rises about 1-2 degrees on acceleration, so there is a chance your pinion angle is set a bit to high as it is, which is causing it to be too high when you accelerate, hence the vibration.

The rear pinion angle should be 1-2 degrees lower than the angle of the driveshaft.

 

[Rob5589]

He has stock suspension. If the pinion angle is off he has some pretty worn out control arm bushings. Which is possible.

 

[Chris]

Crap, missed the stock suspension part. Disregard my comment in that case.

However, worn out control arm bushings is indeed possible.

 

[Shane Mckinley]

Crap, missed the stock suspension part. Disregard my comment in that case.

However, worn out control arm bushings is indeed possible.

I've messaged Nick about control arm bushings. Would that really do acceleration vibs??

O-o

Just add it to the to do list lol
Can't say I'm surprised. 226k
Who knows what's all original


Sent from my iPhone using Tapatalk

 

[Chris]

At 226k, it's highly probable that most of your suspension and steering components are worn. It might be a good time to refresh all of those components in all honesty. Control arm bushings, tie rod ends, u-joints, etc.

 

[Rob5589]

Sure, 226k is a ton of miles on suspension. Under accel, if the control arm bushings are shot, the pinion could be moving up beyond where it should causing driveline vibrations.

 

[Shane Mckinley]

At 226k, it's highly probable that most of your suspension and steering components are worn. It might be a good time to refresh all of those components in all honesty. Control arm bushings, tie rod ends, u-joints, etc.

I have a full set of Spicer ball joints and HD steering kit just waiting for the time to get it on. Those are checked off

I guess the control arm bushings need to get ordered too just for good measure


Sent from my iPhone using Tapatalk

 

[Chris]

I have a full set of Spicer ball joints and HD steering kit just waiting for the time to get it on. Those are checked off

I guess the control arm bushings need to get ordered too just for good measure


Sent from my iPhone using Tapatalk

Oh yeah, those will help. Add some control arm bushings to the mix and you'll be covering good majority of it.

 

[Shane Mckinley]

How difficult is it to get those bushings out and back in without a press? I have a bench vice but I'm not sure it will suffice.

I can get new arms for $195 but bushings are considerably cheaper especially with the stock arms are fine


Sent from my iPhone using Tapatalk

 

[bobthetj03]

Don't mess with trying to get those bushing out of the stock CA's. Just buy new CA's with the bushings installed.

 

[Chris]

How difficult is it to get those bushings out and back in without a press? I have a bench vice but I'm not sure it will suffice.

I can get new arms for $195 but bushings are considerably cheaper especially with the stock arms are fine


Sent from my iPhone using Tapatalk

Honestly, I'm not entirely sure. When I replaced mine I just went with these:
https://www.amazon.com/dp/B01MPVWEBY/?tag=wranglerorg-20

That seemed easier to me, because all the control arms already have the bushings in them.

 

[Shane Mckinley]

Honestly, I'm not entirely sure. When I replaced mine I just went with these:
https://www.amazon.com/dp/B01MPVWEBY/?tag=wranglerorg-20

That seemed easier to me, because all the control arms already have the bushings in them.

I'm pretty sure those are the ones Nick quoted me


Sent from my iPhone using Tapatalk

 

[Chris]

I'm pretty sure those are the ones Nick quoted me


Sent from my iPhone using Tapatalk

Could be. Those are all the factory replacements, same ones I used when I did mine. Much easier than trying to replace all the bushings individually IMHO.

 

[Rob5589]

Don't mess with trying to get those bushing out of the stock CA's. Just buy new CA's with the bushings installed.

Agree. Those things are a bitch to get out. I did them in my XJ; never again. They are too cheap to spend so much time and energy on.

 

[Ahoragi]

Have you checked your pinion bearings, transfer case bearings, and have you replaced the ujoints in the driveshafts?