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Old 06-18-2014, 10:43 AM
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Tire Pressure?

What do you keep in your 35s? I have 30 pounds in mine and I do not think it is enough.

When I first got my Jeep I would get a death wobble when I would accelerate and it would stop when I took my foot off the pedal. Only once a day: Weird...

I went wheeling a few weeks later, aired down, aired up, and the wobble disappeared. Now it is back and I deal with it everyday. I'm over it.

I want to say that my air pressure is what causes it; it disappeared for months until I went wheeling in April and aired down again.

Any ideas?

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Old 06-18-2014, 11:03 AM   #2
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Originally Posted by RoseBud13 View Post
What do you keep in your 35s? I have 30 pounds in mine and I do not think it is enough.

When I first got my Jeep I would get a death wobble when I would accelerate and it would stop when I took my foot off the pedal. Only once a day: Weird...

I went wheeling a few weeks later, aired down, aired up, and the wobble disappeared. Now it is back and I deal with it everyday. I'm over it.

I want to say that my air pressure is what causes it; it disappeared for months until I went wheeling in April and aired down again.

Any ideas?
30 psi for 35's is way too much. You should be running them around 26 psi max. Less if lightly loaded. Get your tires balanced first and see if that solves your wobbles. It isn't death wobble if it goes away when you take your foot off the gas.

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Old 06-18-2014, 11:04 AM   #3
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Don't know about air pressure causing DW but I guess it could.

To find the correct tire pressure for your jeep do this in an empty parking lot where you can drive back and forth in a straight line WITHOUT turning.

Get a LARGE stick of chaulk and draw a straight line across all four tires.
Drive back and forth for at least 200'.
Look at the chaulk lines, if the center is the only worn spot you are over inflated, let a little out and repeat.
If the outsides are the only worn spots then you are under inflated. Add a little and repeat.

Now if the line is worn evenly across the tire your right on. Keep this pressure in mind as you normal street pressure.

Make sence??
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Old 06-18-2014, 11:22 AM
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Don't know about air pressure causing DW but I guess it could.

To find the correct tire pressure for your jeep do this in an empty parking lot where you can drive back and forth in a straight line WITHOUT turning.

Get a LARGE stick of chaulk and draw a straight line across all four tires.
Drive back and forth for at least 200'.
Look at the chaulk lines, if the center is the only worn spot you are over inflated, let a little out and repeat.
If the outsides are the only worn spots then you are under inflated. Add a little and repeat.

Now if the line is worn evenly across the tire your right on. Keep this pressure in mind as you normal street pressure.

Make sence??
Yes. I will have to try this. The wobble I get shakes my entire Jeep, but it feels like it comes from the front end.
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Old 06-18-2014, 12:44 PM   #5
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Read the sticky at the top regarding death wobble. You probably have worn out parts in front end
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Old 06-18-2014, 07:05 PM   #6
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30 psi is, as already said above, way too high of an air pressure for 35's. I can't recommend the chalk method of testing for proper psi because except when performed by someone who is experienced and knows what are acceptable air pressures, it most often leads to a severely underinflated tire. That is because for most tires, the entire tread is not supposed to touch the ground and many continue airing down until the entire tread (chalk line) is touching evenly. For most 35's supporting a TJ, 24-26 psi is right... 24 around town when unloaded, 26 psi when on the highway and loaded up.

DW is commonly triggered by an imperfectly balanced tire in combination with a loose component which is often the track bar. Try the dry steering test to see if you can spot anything loose that shouldn't be loose. With the tires on the ground, have a helper turn the steering wheel repeatedly back & forth while you watch the steering system where its various connections are and see if anything has movement where it shouldn't. Especially look at the passenger-side mount of the track bar where there should be ZERO side-to-side movement as the steering is moved left/right.
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Old 06-19-2014, 12:34 AM   #7
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Well said!
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Originally Posted by jeff_in_rc View Post
Don't know about air pressure causing DW but I guess it could.

To find the correct tire pressure for your jeep do this in an empty parking lot where you can drive back and forth in a straight line WITHOUT turning.

Get a LARGE stick of chaulk and draw a straight line across all four tires.
Drive back and forth for at least 200'.
Look at the chaulk lines, if the center is the only worn spot you are over inflated, let a little out and repeat.
If the outsides are the only worn spots then you are under inflated. Add a little and repeat.

Now if the line is worn evenly across the tire your right on. Keep this pressure in mind as you normal street pressure.

Make sence??
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Old 06-19-2014, 09:36 AM
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Read the sticky at the top regarding death wobble. You probably have worn out parts in front end
That's what is confusing. I have had my boyfriend and my father who both drive Jeeps and they saw nothing worn. I'm changing my brakes and rotors this weekend so I will have to poke around....
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Old 06-19-2014, 09:38 AM
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Thanks guys. Y'all were a big help!
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Old 06-19-2014, 10:35 AM   #10
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Originally Posted by Jerry Bransford View Post
DW is commonly triggered by an imperfectly balanced tire in combination with a loose component which is often the track bar. Try the dry steering test to see if you can spot anything loose that shouldn't be loose. With the tires on the ground, have a helper turn the steering wheel repeatedly back & forth while you watch the steering system where its various connections are and see if anything has movement where it shouldn't. Especially look at the passenger-side mount of the track bar where there should be ZERO side-to-side movement as the steering is moved left/right.
Do this^^^^
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Old 06-19-2014, 11:35 AM   #11
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Well said!
Thank you!

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