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Old 09-12-2019, 11:23 AM
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Jeep swerves at high speeds

Hi there! My '07 JK seems to swerve at high speeds (50+ mph). I have to constantly correct it to keep it in the lane. I just had a TON of work done to it:
  • New Ball Joints
  • New Tie Rods
  • New Axle Seals
  • New Knockout pins
  • Alignment
  • New Tires
  • New Front & Rear shocks
  • New Steering Stablilizer
  • New U Joints

I have a 1" lift (buddy was parting out his rubicon a while ago, so I took his springs, shocks, and other rubicon parts and put on mine). I am at a loss for what it could be. Any ideas or anyone who has had this problem in the past and knows a fix for it? Thank you in advance!

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Old 09-12-2019, 11:35 AM   #2
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Did the need to constantly correct start only after all of the above work was done?
If so, you may just be experiencing one of the joys of 'tight' new ball joints and tie rod ends. The same thing happened to me after new ball joints and new tie rod & drag link. If this is the problem, it will get better over the next 500 - 1000 miles.


If it is only pulling in one direction, check the steering stabilizer. Some gas charged stabilizers will induce a steering pull to one side.


I suppose it could also be your alignment, but if it is within factory spec on all numbers it shouldn't be the cause.

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Old 09-12-2019, 11:58 AM   #3
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What size tire? is it all the time above 50 or is it worse on some roads then it is others. I have 315/70/r17's and it really likes to trammel and pull all over the place on badly rutted and crowned roads.
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Old 09-12-2019, 12:26 PM   #4
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Adjustable Track Bar? Are the wheels centered in the front (alignment won't tell you that)
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Old 09-12-2019, 01:15 PM   #5
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What tire pressure are you running?
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Old 09-12-2019, 11:23 PM
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Originally Posted by trashmanssd View Post
What size tire? is it all the time above 50 or is it worse on some roads then it is others. I have 315/70/r17's and it really likes to trammel and pull all over the place on badly rutted and crowned roads.
I am running 285/70/R17's mud-terrains and the road sometimes makes a difference, but this happens even on nice even roads.
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Old 09-12-2019, 11:23 PM
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Originally Posted by bdog22 View Post
Adjustable Track Bar? Are the wheels centered in the front (alignment won't tell you that)
I do not have an adjustable track bar and I guess I haven't checked if the wheels are centered. How would I do that besides eyeballing it?
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Old 09-12-2019, 11:24 PM
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What tire pressure are you running?
Currently 38PSI. I was told by some of my friends that I should do a chalk test to determine proper PSI for my rig
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Old 09-13-2019, 12:57 AM   #9
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Are your sway bar links present and attached?
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Old 09-13-2019, 01:08 AM   #10
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Currently 38PSI. I was told by some of my friends that I should do a chalk test to determine proper PSI for my rig
Drop to 28 and test drive. Welcome to the forum by the way.
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Old 09-13-2019, 08:37 AM   #11
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I run around 30 PSI myself. 37 is way too high, it will cause a lot of bounce and a rough ride overall.

Check YouTube for video on centering the front wheels, but it is as simple as taking a measurement from your front shock to a point on your tire. Check right, check left, if not equal, you need and Adj TB. Then set it to the same as stuck and add the necessary distance to center them back up. NOTE: Once side of the TB is attached the to frame...so if your 1" in on the left and 1" out on the right, add 1/2" and you should be pretty close to center. Again check YouTube for instructions, lots of good videos, some use a come along, some move the vehicle, some just push it to center it. I also ordered the upgraded bolts to properly fit the holes. Good luck! and Welcome to the Forum.
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Old 09-13-2019, 08:38 AM   #12
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I run around 30 PSI myself. 37 is way too high, it will cause a lot of bounce and a rough ride overall.

Check YouTube for video on centering the front wheels, but it is as simple as taking a measurement from your front shock to a point on your tire. Check right, check left, if not equal, you need and Adj TB. Then set it to the same as stuck and add the necessary distance to center them back up. NOTE: Once side of the TB is attached the to frame...so if your 1" in on the left and 1" out on the right, add 1/2" and you should be pretty close to center. Again check YouTube for instructions, lots of good videos, some use a come along, some move the vehicle, some just push it to center it. I also ordered the upgraded bolts to properly fit the holes. Good luck! and Welcome to the Forum.
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Old 09-13-2019, 08:42 AM   #13
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Yeah, 38 psi is high for stock size tires. It is really high for larger than stock tires.
28 - 30 psi tends to be where most larger than stock tires want to be.
As someone already asked, when did this start?
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Old 09-13-2019, 09:51 PM   #14
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In case it was missed by the OP, did the current issue start only after all of the upgrades?

And does it wander to the left or to the right, or is it in a particular direction?

When you turn the steering wheel, is there immediate response or is there play?
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Old 09-13-2019, 10:16 PM   #15
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Yea drop the tire pressure

Been there... done that....

It’s crazy how much these things wonder when there is to much air. My Jeep really starts wondering bad when it has over 35 psi....
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Old 09-14-2019, 04:25 PM   #16
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I also ran 30-32 psi with 285/70R10 MTs.


A couple of other things you might check, if the steering is a bit loose, (how much free play is there in the steering?):

Steering box play.

The 2 part shaft, (from steering wheel to steering box), in the engine bay may need regreasing under the boot. People have reported that the splines can wear if it gets too dry.
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Old 09-15-2019, 03:05 PM   #17
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Welcome to the forum. You have a 2dr and a slight amout of lift. Obviously way to much tire pressure. Do as @Lee H suggested and start with 28 PSI. Depending on your tire sidewall and weight of the JK, you may have to go even lower. You mentioned an alignment. What was your caster after the work. 2dr JKs like to run closer to 5 deg+ caster. Some even more.

You could be experiening a combination of influences.

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