Bump steer on my 2004 Rubicon with my 4 inch Terflex LCG long arm kit/1"BL and 1"MML - Jeep Wrangler Forum
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Old 03-19-2016, 04:44 PM
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Bump steer on my 2004 Rubicon with my 4 inch Terflex LCG long arm kit/1"BL and 1"MML

I bought it like this, I installed a 1.25 daystar BL kit and a 1 inch mml kit. Bump steer is the same as when I got it, it's not the worst, no death wobble but it does jerk when going over bumps on the freeway at higher speeds above 40 or so then of course the body rolls due to the kit as that's what its suppose to do which doesn't make for a great experience at times. and my plan is to go to 35 inch tires it has 31.5 inch on it now with bead locks, I want to get this addressed before I go bigger obviously. I torqued and greased everything to specs when I got it per the kit including all the steering linkage, stabilizer and all the arms at both ends. The jeep came with the long arm LCG pro kit on it..Seems there was no mods made to the trac bar, maybe I am wrong as you can tell from the pics, doesn't appear to be a drop bracket at the fram or a rise bracket at the axle...Kit comes with a drop pitment arm that was installed I have attached pictures

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Old 03-19-2016, 04:57 PM   #2
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Lose the dropped pitman arm. Then do a dry steering test, wheels on ground someone moving the steering left right while you look for anything moving that looks loose.

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Old 03-19-2016, 05:09 PM   #3
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Yep, the dropped pitman arm is the reason you have bump steer. Get rid of it, it's not needed and is screwing up your steering geometry.
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Old 03-20-2016, 01:02 AM
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Really dumb question, Will I need the DPA with the bigger tires? Going for 31.5 to 34.6....Can't figure out in my imagination if the will change the steering geometry....
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Old 03-20-2016, 01:32 AM   #5
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Deja vu.... Nope
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Old 03-20-2016, 08:45 AM   #6
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Your dropped pitman arm is lowering your drag link angle below you track bar angle. Ideally they should be as similar as possible.
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Old 03-20-2016, 09:32 AM   #7
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Quote:
Originally Posted by fishnwheel View Post
Really dumb question, Will I need the DPA with the bigger tires? Going for 31.5 to 34.6....Can't figure out in my imagination if the will change the steering geometry....
Think about this....

Taller tires raise EVERYTHING. They don't change the relationship between your drag link and track bar, that makes no sense.

You have bump steer now because the pivot points for your drag link and the pivot points for your track bar are not inline, causing the two links to travel through different arcs. The previous owner did what a lot of stupid previous owners do - install a dropped pitman arm for no reason at all. I would recommend a stock pitman arm first and most importantly and a Metalcloak track bar second and less important.
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Old 03-21-2016, 01:10 PM
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So quick update, spoke to a tech at Terflex, he said my 2 options are go back to stock pitment arm like everyone is suggesting, or Buy there trac bar and weld on trac bar frame bracket. He said if I'm not wheeling very often Ill be fine, however he did warn me saying that over time it could wear out the rod end joints of my drag link because when the suspension is at full droop, it will essentially be hanging on that joint, enlighten me further on this if possible. Also I failed to mention I have the Currie HD tie rod /drag link steering setup. Id really rather not spend 400.00 on parts and have to weld on another bracket if possible, however keep in mind this is a long arm kit with lots of flex. Let me know what you guys think...
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Old 03-21-2016, 01:14 PM   #9
Knows a couple things...

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Just go back to the OE non-dropped Pitman arm which is the correct/best fix for your bump steer. That dropped Pitman arm should have never been installed, there is no benefit to having it for your configuration.

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