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Old 01-01-2016, 11:13 AM
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Question Bump Steer on 2.5 Inch Lift?

Hey All -

Did some searching and read an excellent thread on death wobble but that's definitely not what I have. I have slight bumpsteer on my JK with the TF 2.5 inch lift. A little surprising that a 2.5 inch lift could cause it...but it's there.

Did some measuring today (from the spring tower to tire) and the body is centered over the front axle with about a quarter inch difference. For the rear, the body is not entirely centered - it's about a half inch off.

So for the front, I wouldn't think a 1/4 of an inch would resolve or be the culprit. (Doesn't sound like I need the front adjustable trackbar after all??)

Any ideas on what is occurring here? Other than the lift, the suspension and wheels are stock - no dropped pitman arm, or drag link changes, etc.

Called a local 4x4 shop and was told some slight bumpsteer is normal and occurs even on stock jeeps. If its bothersome I should replace the steering damper shock - seems like that simply masks the issue to me...but what do I know =)

Thanks for any input.

Front Left:



Front Right:


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Old 01-01-2016, 12:52 PM   #2
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You are correct, the damper will just mask the problem.

The only situation that causes bumpsteer is a misalignment of draglink and trackbar. This can be caused by worn or loose bolts since you have not changed any components. Worn balljoints or steering components may give the feel of slight bumpsteer but it really isn't bumpsteer per say. Other situations could be the loss of some of your caster which can cause a jittery effect on rough roads. Stiff springs and shocks will enhance the effect.

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Old 01-01-2016, 01:10 PM
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Originally Posted by JTPhoto JK View Post
You are correct, the damper will just mask the problem.

The only situation that causes bumpsteer is a misalignment of draglink and trackbar. This can be caused by worn or loose bolts since you have not changed any components. Worn balljoints or steering components may give the feel of slight bumpsteer but it really isn't bumpsteer per say. Other situations could be the loss of some of your caster which can cause a jittery effect on rough roads. Stiff springs and shocks will enhance the effect.
Thanks for the reply - so in your opinion it sounds like I don't need the front adjustable trackball (given that the axle is nearly centered) but it sounds like I do need front adjustable lowers and uppers perhaps?

Any idea what the ideal adjustments would be for the uppers and lowers for a 2.5 inch lift if thats whats needed?

Thanks
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Old 01-01-2016, 01:22 PM   #4
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at 1/4" difference you don't need an adjustable track bar but hey for $107 I would get one. They are easy to install and takes away all doubt. I agree with jtphoto sometimes we think we are getting bumpsteer and its not. I would loosen every thing up and then retorq to proper specs. It is free and wont take but an hour at most.
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Old 01-01-2016, 01:27 PM   #5
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Originally Posted by theprez1980 View Post
Thanks for the reply - so in your opinion it sounds like I don't need the front adjustable trackball (given that the axle is nearly centered) but it sounds like I do need front adjustable lowers and uppers perhaps? Any idea what the ideal adjustments would be for the uppers and lowers for a 2.5 inch lift if thats whats needed? Thanks
You can get the Teraflex sport 8 flexarm kit 1258000. It has all 8 arms, fixed length that are setup for a 2.5-3 inch lift.
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Old 01-01-2016, 01:32 PM   #6
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I agree with @jadmt , for $107 the Superlift bar has tighter/better joints than the stock track bar and is certainly worth the small investment.

As for bump steer, I'll give the shop you spoke to some credit... Even a brand new stock Jeep can experience a little bump steer because the drag link and track bar are different lengths to begin with. While keeping them parallel is really important, it isn't the only factor.
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Old 01-01-2016, 01:54 PM   #7
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Check the drag link ends. Worn ends will cause a shimmy as described. Centering the axle is not your problem.
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Old 01-01-2016, 02:07 PM
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You can get the Teraflex sport 8 flexarm kit 1258000. It has all 8 arms, fixed length that are setup for a 2.5-3 inch lift.
Thanks - I had the Teraflex lower control arms that in a similar kit that was for the 2.5-3" lift but it wasn't enough...which is why they used that along with cam bolts to dial in the alignment.

I suppose it's best to get the entire kit that has the adjusters...though its a bit pricier =(

My 2014 has less than 5K miles on it so I'd hope nothing is worn out yet...has barely been off road so far =)
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Old 01-01-2016, 02:26 PM   #9
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Check the drag link ends. Worn ends will cause a shimmy as described. Centering the axle is not your problem.
^^^^I did this and found that a worn end was my problem. I used "Planmans" Youtube video on diagnosing death wobble. You don't have death wobble but its a good step by step video on diagnosing some front end issues. I am no mechanic but following the video made my problem stand out like a sore thumb. PS I had 11k on the clock when I found the worn end.
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Old 01-01-2016, 02:31 PM   #10
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^^^^I did this and found that a worn end was my problem. I used "Planmans" Youtube video on diagnosing death wobble. You don't have death wobble but its a good step by step video on diagnosing some front end issues. I am no mechanic but following the video made my problem stand out like a sore thumb. PS I had 11k on the clock when I found the worn end.
Sueby stopped over with a shimmy issue. Same thing, her AEV stock DL was popping up and down when doing the steering test. She went with a Synergy DL... Problem fixed.

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