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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > Bump steer, need help please(been to faqs)

ZONE 4.25" combo lift for TJ available at Rockridge4wWarn, Smitybilt, Engo, Rugged Ridge Winches at CCORRough Country Lift Kits and Parts!

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Unread 09-04-2011, 09:18 PM   #1
WJRON351
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2002 WJ 
 
Join Date: Jul 2009
Location: Europe
Posts: 287
Bump steer, need help please(been to faqs)

Hi JF members, here's my Jeep


Here are the specs
3" IRO springs (+ 2" pucks not shown on pic)
Bilstein 5125 shocks (not on pic)
IRO heavy duty track bar
1" IRO TC drop
IRO A-arm spacer
IRO 4" sway bar links front and rear
Tenneco heavy duty SS from IRO
IRO front adj UCA and LCA
i followed Arlo's specs for 4,5"-5" lift
wich are UCA lengt : 16"
LCA lengt : 17"
If i understood right, DW is a continuous shake when driving?, i don't have but i have serious bumpsteer when hitting a hole when driving between 30mph and 45mph.
Any suggestion to cure?
I know, "don't drive at those speed" any other idea?
Thank you guys

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Unread 09-04-2011, 10:26 PM   #2
billzcat1
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2003 WJ 
 
Join Date: Oct 2008
Location: Redmond, WA
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Go with a stock backspacing wheel to reduce scrub radius.

Go with long arms, at 5" lift you have some nasty control arm angles and impact forces are routed into the arms/body as opposed to absorbed by the shocks.
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Unread 09-05-2011, 12:06 AM   #3
RedlegWJ
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Bump street is the slop in your steering, I/e freeplay. 1st thing to check is the pitas ARM and It's link. Also if your track bar is adjusted correctly, axle centered and tb parallel to the drag link. Usually not an issue with wjs though. Steering box may worn or need adjusting.
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Unread 09-05-2011, 08:27 AM   #4
WJRON351
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Thank you guys, i'll check the pitman arm, maybe need a dropped one finally, i know long arms would be good thing but not street legal in my country.
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Unread 09-05-2011, 08:40 AM   #5
skain8
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Quote:
Originally Posted by WJRON351 View Post
Thank you guys, i'll check the pitman arm, maybe need a dropped one finally, i know long arms would be good thing but not street legal in my country.
No, do not drop your pitman arm. That will cause true bumpsteer by taking out of parallel your steering arms.
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'02 WJ: 4.7L, 5", HP44/9", 231HD, tall & skinny KM2's
'99 XJ: stock
'99 XJ: stolen
'06 XK: sold
231HD build guide
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Unread 09-05-2011, 08:42 AM   #6
WJRON351
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still haven't checked if they are paralel, maybe that's were my troubles come from. only have bump steer when hitting a good hole between 30 and 45 mph
At 60 to 120 mph, no troubles
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Unread 09-05-2011, 08:53 AM   #7
skain8
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Quote:
Originally Posted by WJRON351 View Post
still haven't checked if they are paralel, maybe that's were my troubles come from. only have bump steer when hitting a good hole between 30 and 45 mph
At 60 to 120 mph, no troubles
They should be parallel. I was saying to not drop the one without dropping the other. If it was bumpsteer, it would be at any speed.

It would be helpful to understand what you deem "bumpsteer".
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'02 WJ: 4.7L, 5", HP44/9", 231HD, tall & skinny KM2's
'99 XJ: stock
'99 XJ: stolen
'06 XK: sold
231HD build guide
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Unread 09-05-2011, 08:58 AM   #8
WJRON351
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Under 30 mph, no problem, over 50 mph no troubles but between those speed, when i hit a hole, the steering wheel shakes really badly and dangerously. I need to stop the jeep to stop the shaking.
I already had that problem at 3" of lift, but not at 2"
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Unread 09-05-2011, 09:22 AM   #9
skain8
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Quote:
Originally Posted by WJRON351 View Post
Under 30 mph, no problem, over 50 mph no troubles but between those speed, when i hit a hole, the steering wheel shakes really badly and dangerously. I need to stop the jeep to stop the shaking.
I already had that problem at 3" of lift, but not at 2"
What you are describing appears more like death wobble.
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'02 WJ: 4.7L, 5", HP44/9", 231HD, tall & skinny KM2's
'99 XJ: stock
'99 XJ: stolen
'06 XK: sold
231HD build guide
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Unread 09-05-2011, 09:58 AM   #10
WJRON351
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Ok, i've read a lot about both DW or bumpsteer. I readthe faqs about DW, i read DW cure on IRO's site and KOR site.
Here's what i've done the last 4 months, i bought new SS (tenneco HD) bought new tie rod ends/ball joints, aligned the Jeep and balanced tires. Used Arlo's specs for adj UCA and LCA. Still shakin'
What to look for now?
I'm tired of that shake thig
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Unread 09-05-2011, 12:45 PM   #11
skain8
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What are your toe and caster settings? Is your trackbar uber tight and the mounting holes not wallowed? If you have a jks bar, do you have the HD bushings? What tire pressure are you running?
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'02 WJ: 4.7L, 5", HP44/9", 231HD, tall & skinny KM2's
'99 XJ: stock
'99 XJ: stolen
'06 XK: sold
231HD build guide
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Unread 09-05-2011, 01:08 PM   #12
tbone1004
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What you have is death wobble not bump steer. Bump steer is more like the wheels not staying straight when you hit a bump but no shaking. It also doesn't persist after the initial bump.

I'm willing to bet it's caused by your trackbar. You mention you have the HD trackbar, but if it is for the 3" lift not the 5" lift that you have it isn't long enough throwing everything out of wack. I'd get a JKS adjustable and try again. Should fix it. Lower your tire pressures a bit as having them too high can cause it. Also note that every time death wobble happens, it is prone to loosening things up and will very very quickly reduce the life of your tie rod ends.
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Unread 09-05-2011, 03:00 PM   #13
WJRON351
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OK, i already have JKS track bar, axles are aligned. i have urethane bushings and all bolts are strongly tightened. Holes were wallowed but a friend fixed it, welded a new steel plate abs drille new holes with bigger bolts.
A friend had the same DW problem, he called me ths afternoon, said double SS fixed his DW. Should try?
Also, tires are at 36 psi. Too much?
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Unread 11-11-2011, 09:00 AM   #14
SDT03GCOverland
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Did you ever resolve this? My WJ had several problems that included bad tie rod and drag link ends, bad control arm bushings AND trackbar bushings. A steering stabilizer is a band-aid and will help reduce DW but if you have DW, SOMETHING somewhere is not right. (loose or misaligned)
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Unread 11-11-2011, 10:56 AM   #15
sinbad85
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I was fighting bump steer for a long time with my 4" lift, the problem with bump steer is at fast enough speeds it turns into DW. I replaced everything and had many alignments, I just put on IRO's steering Equalizer, ( not steering dampener). Best $300 for getting rid of bump steer for me,
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2001 WJ 4.7L-selec-trac/4.5" Teraflex springs\IRO Long arms\Iro adj rear LCA/Bilstien 5100 series shocks/ IRO steering Equalizer/|265/75/16 Goodyear Dura-Tracs on Stock rims\Rear Tube Bumper with carrier|sliders|mopar skids.
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