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Scary unstable highway driving. 6.5" RC 35s PLEASE HELP

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Old 06-13-2011, 07:56 PM
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Default Scary unstable highway driving. 6.5" RC 35s PLEASE HELP

Okay so i have been fighting this problem for a while and I cant figure it out. the truck has 35" MTZ, 6.5" Rough country long arms, 488s and JCR 1 ton steering Under the knuckle. Also bilstein 5150s in front to add

At first the jeep was pulling to the left when braking. I changed calipers and brakes yada yada. I adjusted the steering some and it seemed to stop the pulling when braking. Now the truck drives pretty decent for a 6.5" lift and 35s up to about 40 mph. Once its on the highway the steering feels sensitive, if i hit a bump it feels like i am about to bounce of the road. It pulls a bit to the right on the highway and i have to be ready for everything.
I am using Rough country's Trac bar drop and trac bar as well as there drop pitman arm. I dont know if this would create bad steering angles with the 1 ton steering but its UTK and not OTK. I used to have 3.5" lift with stock steering, stock gears, 33s and that setup was a 100 times better than this.

So ive tripple checked the toe in with 2 different tape measures lol and the measurement is the same on both sides. The kit requires 15 1/4 of length for upper arms. I made them about 15" to add more caster. Didnt help. I checked the distance between the front and rear tires on both sides and just about even. Trac bar distances from wheel to frame wheel to frame just about even (when i say just about even i mean maybe 1/16" off)

I replaced 3 out of 4 of the tie rods in the steering, (4th one seems good). Had to add a washer to the pitman arm to bring it up higher, and steering box bolts are tight. Also replaced one hub bearing with a known good spare, the other seems good but will put on the other good known spare soon. (from old front axle) Balljoints seem tight as well.

I dont know what else to check Everything has less than 1000 miles on it. I know this is a long post but ive tried just about everything please HELP!!!!

-Thanks

Mike

Last edited by mikeXJ1020; 06-13-2011 at 07:59 PM.
Old 06-13-2011, 08:12 PM
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post a picture of your steering angles.

I run 7.25" lift on mine and have had no problems and mine gets driven on the highway daily...

sounds like bar steering angles/alignment.

I would get a professional alignment.
Old 06-13-2011, 08:26 PM
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sounds like steering geometry. What happens if you go faster then 40mph? Does it wobble?

Last edited by Littlethunder92; 06-13-2011 at 08:28 PM.
Old 06-13-2011, 08:29 PM
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changing your upper control arm lengths to the lenghts that you did will add WAY TO MUCH caster cuaseing all your issues you are talking about. your upper arms should be between 15 1/4 - 15 3/4 or mabye even more it all really depends on your truck and i would recomend taking your truck in to get a professinal alginment becuase no offense but it seems like you dont really know what your doing IMHO
Old 06-13-2011, 08:38 PM
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I know it is a little hard to see but mine are set at 15 3/8" and it was perfect
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Old 06-13-2011, 08:52 PM
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Over 40 mph no wobbling, no death wobble. Adjusting the arms tighter added better caster yet worse pinion. I have heard that you want as much caster as you can before your front shaft starts to vibrate. Adding the caster helped the steering wheel recenter after turns and did help a little bit. My pinion is now lower and looked as if yours did (96_xj) before the adjustment

Here are pictures of the steering angles






Quality is a little crap but not bad

Last edited by mikeXJ1020; 06-13-2011 at 08:55 PM.
Old 06-13-2011, 08:54 PM
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ahh pictures wont add.. hang on

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Old 06-13-2011, 09:00 PM
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Originally Posted by mikeXJ1020
Over 40 mph no wobbling, no death wobble. Adjusting the arms tighter added better caster yet worse pinion. I have heard that you want as much caster as you can before your front shaft starts to vibrate. Adding the caster helped the steering wheel recenter after turns and did help a little bit. My pinion is now lower and looked as if yours did (96_xj) before the adjustment

Here are pictures of the steering angles






Quality is a little crap but not bad
This is correct. if you have no death wobble it is not a castor issue. get the pic up of your steering angles. off hand that sounds to be the culprit.
also try and make sure you get a good pic of the trackbar and drag link towards the box end. and the overall angles of everything
Old 06-13-2011, 09:01 PM
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try again
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Old 06-13-2011, 09:03 PM
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Uno mas

Also if the sway bars are connected or not still feels the same
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Old 06-13-2011, 09:09 PM
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I wanna say decent but idk
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Old 06-13-2011, 09:15 PM
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Might sound crazy but sounds to me to be as simple as sway bar links? Do you run some?
Old 06-13-2011, 09:20 PM
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Originally Posted by brutalxj
Might sound crazy but sounds to me to be as simple as sway bar links? Do you run some?
with or without the problem is the same.
Old 06-13-2011, 09:24 PM
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this could be your problem.

yes more caster will help steering wheel return but you really want like 7 - 7.5 degrees of caster. your track bar almost looks like its too long as well
Old 06-13-2011, 09:26 PM
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this is what my angles look like



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