Bump Steer Problem.. - JeepForum.com

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post #1 of 22 Old 08-16-2015, 10:12 AM Thread Starter
LubbTJ
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Bump Steer Problem..

Hey guys.. I just installed savvy/currie ultimate steering on my jeep about 3 weeks ago.. and have been trying to fine tune the alignment etc. But I have a severe bumpsteer, Whenever I hit a low spot, pot hole, dip, uneven road, on one side or the other... I get a bad steering sway / bump steer. I'm not really sure what to adjust or do from here.

I have full savvy 4" lift 1.25" BL, with currie trac bars front and rear.. and front antirock.

I'll Note that before I installed the new steering.. the steering was fine.. no bump steer at all.

Below are pics I took today.







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post #2 of 22 Old 08-16-2015, 10:36 AM
Jerry Bransford
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That's very mysterious issue you're describing. There's nothing wrong that I can see in your geometry and there's no dropped Pitman arm installed that would cause bump steer. Currie's steering kit itself certainly doesn't cause bump steer since it utilizes the same factory steering geometry that you removed.

This will be an interesting thread to follow.

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post #3 of 22 Old 08-16-2015, 10:51 AM Thread Starter
LubbTJ
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One thought was my upper and lower ball joints on my knuckles. I changed them out on one side... and one of them appears to be not fully seated by maybe an 1/8 inch. If those ball joints are bad.. will they cause bump steer like that?

I traded vehicles with my boss the other day cause I was driving his truck to pull a trailer.. and he drove my jeep. Afterwords he was complaining about how sketchy it was, and it was horrible to drive.. didn't know what it was gonna do when you hit a 1 sided bump.
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post #4 of 22 Old 08-16-2015, 10:56 AM
mrblaine
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Quote:
Originally Posted by LubbTJ View Post
One thought was my upper and lower ball joints on my knuckles. I changed them out on one side... and one of them appears to be not fully seated by maybe an 1/8 inch. If those ball joints are bad.. will they cause bump steer like that?

I traded vehicles with my boss the other day cause I was driving his truck to pull a trailer.. and he drove my jeep. Afterwords he was complaining about how sketchy it was, and it was horrible to drive.. didn't know what it was gonna do when you hit a 1 sided bump.
Describe what you are calling bump steer.

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post #5 of 22 Old 08-16-2015, 11:06 AM Thread Starter
LubbTJ
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Originally Posted by mrblaine View Post
Describe what you are calling bump steer.
It's usually when I hit a dip/pothole or uneven road surface on one side of the jeep... and it makes my jeep swerve that way. On a nice flat surface.. I can let go of the wheel and it will hold a nice straight line.
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post #6 of 22 Old 08-16-2015, 11:08 AM Thread Starter
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If I hit a bump that's equal across the road... like a speed bump... or drainage joint in the road.. it doesn't effect my steering. Only bumps/dips that are on one side.
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post #7 of 22 Old 08-16-2015, 11:31 AM
mrblaine
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Originally Posted by LubbTJ View Post
If I hit a bump that's equal across the road... like a speed bump... or drainage joint in the road.. it doesn't effect my steering. Only bumps/dips that are on one side.
What is the effective backspacing on your rims?

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post #8 of 22 Old 08-16-2015, 11:33 AM
mrblaine
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Originally Posted by LubbTJ View Post
If I hit a bump that's equal across the road... like a speed bump... or drainage joint in the road.. it doesn't effect my steering. Only bumps/dips that are on one side.
Simple test, do us all a favor and remove that stabilizer and take it for a drive. Borrow a conventional hydro version, install it, do the same. Report back the differences.

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post #9 of 22 Old 08-16-2015, 11:35 AM
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What is your caster? From the picture it appears that the differential is tipped way too far up.
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post #10 of 22 Old 08-16-2015, 11:41 AM Thread Starter
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Originally Posted by mrblaine View Post
what is the effective backspacing on your rims?
3.75
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post #11 of 22 Old 08-16-2015, 11:44 AM Thread Starter
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Originally Posted by Red Rubicon View Post
What is your caster? From the picture it appears that the differential is tipped way too far up.
It's likely wrong... I haven't adjusted caster yet. Right now the return to center is non-existant.. you turn the wheel and let go... it's stays in that direction.

Edit: I just went out and checked with an angle finder... the ground the jeep is sitting on shows 0 Degrees... and the caster shows 5.5
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post #12 of 22 Old 08-16-2015, 11:51 AM Thread Starter
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Quote:
Originally Posted by mrblaine View Post
Simple test, do us all a favor and remove that stabilizer and take it for a drive. Borrow a conventional hydro version, install it, do the same. Report back the differences.
Will do this now... I still have my old rancho stabilzer.
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post #13 of 22 Old 08-16-2015, 11:52 AM
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Quote:
Originally Posted by LubbTJ View Post
It's likely wrong... I haven't adjusted caster yet. Right now the return to center is non-existant.. you turn the wheel and let go... it's stays in that direction.
Get your caster adjusted, that is your problem not the steering linkage.
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post #14 of 22 Old 08-16-2015, 11:59 AM
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I agree with red rubicon. If it was true bump steer i believe that it would affect the driving both when you hit a bump with just one or both tires. Your issue sounds more like a caster or alignment issue to me.

jeepforum.com/forum/f176/2000-tj-build-2269009
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post #15 of 22 Old 08-16-2015, 12:05 PM
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Originally Posted by my1979impala View Post
I agree with red rubicon. If it was true bump steer i believe that it would affect the driving both when you hit a bump with just one or both tires. Your issue sounds more like a caster or alignment issue to me.
Nobody has mentioned toe in yet?

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