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Old 01-12-2009, 10:44 AM   #1
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Front susupension.

I just bought my first Wrangler. It's a 98 w/4" Pro Comp Lift & 33" tires. It's
not my dd, just a toy. The jeep seems to wonder back and forth as you drive
it. I just replaced all the shocks & steering stab. That helped a little. Is this
something that I'm just going to have to get use to.

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Old 01-12-2009, 01:41 PM   #2
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sounds like it either needs alligned or the tires need balanced and/or replaced.....some might say the track bar is loose but you would really know somehting was wrong if that was the problem(death wobble)

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Old 01-12-2009, 02:10 PM   #3
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Thanks flattietj, i'm going to have the front end alligned after I put new tie rod ends &
ball joints in. The jeep has 120k on it, and the previous owner couldn't tell me much
about the maintenance that had been done on it. So i'm slowly doing maintenance to it.
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Old 01-13-2009, 05:21 PM   #4
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Please be sure to post the results of the alignment and such. I have a 2001 TJ with 90K on it that does the same thing. Steering seems tight but it just wants to wander on back roads, not so much on highway.
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Old 01-13-2009, 05:28 PM   #5
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Well, welcome to the forum. I hope you get the prob fixed. How about posting some pics?
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Old 01-13-2009, 05:33 PM   #6
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Check your tire pressure too. Running too high of a psi will make you ride on the center of the tread and that can cause the steering to wonder as well.
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Old 01-14-2009, 02:29 PM   #7
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To AzTJ, I have been thinking about tire pressure my self. Right now i'm running 30psi
cold. The tires are pro comp 33 x 12.50 all terrain. It jars the Jeep pretty hard when you
hit a bump.
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Old 01-14-2009, 03:04 PM   #8
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Wandering is usually from the toe-in being off, or less likely perhaps not enough caster angle.

For 33x12.50 tire, I'd run no higher than 28 psi.

Are you comfortable working on your Jeep? If so, you could easily set your own toe-in with just a tape measure, a wrench, and 15-20 minutes. With minimal care, your toe-in adjustment will be just as accurate as an alignment shop can produce.
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Old 01-14-2009, 03:17 PM   #9
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why only 28 psi i usually run 32 ?
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Old 01-14-2009, 04:03 PM   #10
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Quote:
Originally Posted by Giancarlo View Post
why only 28 psi i usually run 32 ?
Because it's appropriate for a 33" tire. 32 psi is excessive for a 33x12.50 tire. Heck the factory only recommends 31 psi for a 30" tire, and the bigger the tire, the less pressure it requires... generally speaking.
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Old 01-16-2009, 11:20 AM   #11
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Jerry, I'm verry comfortable do mechanic work. I was a diesel mechanic for 18 years.
But a good mechanic knows when to ask for help. What would be a good measurement
for the toe in.
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Old 01-16-2009, 12:05 PM   #12
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1/16" to 1/8" of toe-in is perfect, no more than that though. The below photos are how I do it... measure from points equal to the tire diameter (for others who aren't former mechanics).
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Old 01-16-2009, 02:23 PM   #13
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Thanks Jerry, if your ever up in east Tennessee give me a buzz and i'll show you around.
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Old 01-16-2009, 03:45 PM   #14
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Thanks, Tennessee is a beautiful state I'd love to visit. Must be from all those Davey Crocket episodes on Walt Disney's TV show I watched as a kid.
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Old 01-16-2009, 07:29 PM   #15
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Wandering...

Immediately after installing a 4.5" Skyjacker lift on my TJ with 33" tires, it wandered badly until I got it aligned. After the alignment, it drove great....

Until.. I moved up to 35" tires. The wandering came back, althoug not as bad. Come to find out, when they mounted the 35" tires, they put 32psi in the tires.

After reducing the pressure to ~28psi, the wandering once again was eliminated.

The tread contact pattern at 32psi was about 70%, right in the middle.

Reducing to 28psi got me to 95+% tread contact pattern.

So - my lessons learned;
1) Alignment is most important and has the most impact on front end 'issues'
2) The larger the tire, the lower the air pressure required
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Old 01-17-2009, 02:41 AM   #16
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i disagree with all the above.. id agree with most of it if it wasnt for the brand name of the lift..

my girl has the 4'' pc lift on her wrangler and it SUCKS.. it pulls real bad left and right.. i knew upgrading her shocks wouldnt do much but make it a little smoother of a ride, not fix the pulling.. im trying to convince her dad into getting a new front trackbar.. i may be wrong but im pretty sure the procomp lift came with a dropped pitman arm..
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Old 01-19-2009, 08:56 AM   #17
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Mine doesn't pull to one side. I have to keep both hands on steering wheel
because you never know if it's going to wonder left or right.
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Old 01-19-2009, 10:36 AM   #18
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Quote:
Originally Posted by MoA View Post
i may be wrong but im pretty sure the procomp lift came with a dropped pitman arm..
If it did, and I think you may be right, it should never have been installed. Installing a dropped Pitman arm will cause bump steer on a TJ unless you also install a dropped upper trackbar mount which the ProComp lift definitely doesn't come with.

If it has a dropped Pitman arm, I'd bet big $$$ your girlfriend's TJ has bump steer which is where the steering is forced left/right when a bump or dip in the road is encountered. Removing the dropped Pitman arm and reinstalling the factory Pitman arm will cure the bump steer.

While the need for a dropped Pitman arm was common on older CJs and YJs when any kind of a suspension lift was installed, it's extremely rare for the TJ which has a different steering design/geometry for it to need a dropped Pitman arm. A dropped Pitman arm is better used as a paper weight 99.99% of the time when you have a TJ.

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