NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > Modified Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's.

Reply
 
Thread Tools Display Modes
  #1  
Old April 8th, 2009, 09:21
Chainer Chainer is offline
NAXJA Forum User
 
Join Date: Aug 2008
Location: Michigan
Posts: 36
Rear end wants to slide on dry roads.

No, I'm not going fast, first of all. It's a Jeep not a racecar, Hehe.

I've got a 1990 Cherokee with 3" Rusty's coils, 3" OME full leaf packs, and skyjacker shocks.

Whats happening is during a left turn the rear end wants to slide out a lot, and feels shaky. The catch is that it's only going over rough roads, and it's only noticeable going left. I also feel bumps a lot more from the rear, almost as though the springs aren't flexing.

I' have re-torqued my u-bolts, and leaf spring eye bolts (with the vehicle's weight on them. It seemed to make it a hair better, but it may be wishful thinking.

This is making me think that it could be the eye bolts themselves, because when installing my lift I broke or cut all of my original bolts. I used the closest smaller standard size instead of the metric bolts because nowhere in my town had them. Even the dealers would have to order them and I needed to be able to drive my jeep to work.

I also had the weld nuts break so we cut them out, and welded a new plate with a hole drilled to the new bolt size over the original pocket and ran a longer bolt through to the inside of the frame rail where we put a new nut. We didn't trust the metal around the new piece of metal with the torque of the bolt after welding a new piece on it, it's a pretty rusty jeep. I did weld the washers to the frame rail and leaf-pocket is case it was the bolt wiggling, and again I think that helped, but not enough to be sure.

So do you think the problem is that I just fubar'ed it with the wrong bolt size?
Reply With Quote
  #2  
Old April 8th, 2009, 09:30
wishihad1 wishihad1 is offline
NAXJA Forum User
 
Join Date: Oct 2006
Location: charlottesville, VA
Posts: 888
Re: Rear end wants to slide on dry roads.

sounds normal to me. ive got a gravel road near me that gets really bad washboard. (lots of bumps in the road the continue to get worse with traffic, looks like waves) when the road is dry, and doing any turns with these bumps your going to slide. with each of those bumps, especially with a leaf sprung rear your tires are going to be loosing a lot of contact time with the ground
Reply With Quote
  #3  
Old April 8th, 2009, 09:42
Goatman's Avatar
Goatman Goatman is offline
NAXJA Member
 
Join Date: May 2002
Location: Bakersfield, CA
Posts: 11,444
Re: Rear end wants to slide on dry roads.

So what's the problem?

Definitely not the different sized bolt. That's just what happens when you turn on a rough dirt road while into the throttle a little. The tires are bouncing and not keeping in contact with the road surface, so the rear end slides sideways. Technically, your shocks have too much rebound valving so the axle isn't dropping out fast enough to maintain contact with the road. I don't know anything about the skyjacker shocks, but they sound too stiff.

Also, don't over tighten the spring eye bolts, they need to be snug but not tight so the springs can move freely. You should be able to turn the bolt head with a wrench when it's tight, if you can't turn the bolt it's too tight, though I doubt this would effect handling at speed, mostly just slow speed flex.
__________________
TEAM/PETTY CASHRacing........2013 Ultra4 Stock Class National Champions
Check out the TEAM Facebook page for the full story of our 2013 winning season: https://www.facebook.com/Team
Thanks to , Falken Tires, Bishop-Buehl Racing Engines, Ten Factory Axles, Brown Dog, Hooker Harness, BILSTEIN, Raceline Wheels, WARN, G&G Auto Repair/Off Road, Yukon Gear and Axle, Full Traction, Cal, Russ, James, and many, many others.
Reply With Quote
  #4  
Old April 8th, 2009, 09:43
Chainer Chainer is offline
NAXJA Forum User
 
Join Date: Aug 2008
Location: Michigan
Posts: 36
Re: Rear end wants to slide on dry roads.

Yeah I would expect something like this on a washboard or dirt road. It just feels almost dangerous how bad is is sometimes on pavement. Could it be the shocks in the rear maybe? I'm not sure how bad skyjacker is with their shocks, but new and free was a price I couldn't beat.

Thanks for the Replies.
I torqued the bolts to spec, with tires on the ground. I do expect a bit of roughness, and a tendency to slide on rough turns, from a lifted jeep with leaves in the rear. This just seems worse than it should be.

Last edited by Chainer; April 8th, 2009 at 09:48.
Reply With Quote
  #5  
Old April 8th, 2009, 09:50
Goatman's Avatar
Goatman Goatman is offline
NAXJA Member
 
Join Date: May 2002
Location: Bakersfield, CA
Posts: 11,444
Re: Rear end wants to slide on dry roads.

What application are the shocks for? They could be for something other than an XJ and be way too stiff. Sounds too stiff to me.
__________________
TEAM/PETTY CASHRacing........2013 Ultra4 Stock Class National Champions
Check out the TEAM Facebook page for the full story of our 2013 winning season: https://www.facebook.com/Team
Thanks to , Falken Tires, Bishop-Buehl Racing Engines, Ten Factory Axles, Brown Dog, Hooker Harness, BILSTEIN, Raceline Wheels, WARN, G&G Auto Repair/Off Road, Yukon Gear and Axle, Full Traction, Cal, Russ, James, and many, many others.
Reply With Quote
  #6  
Old April 8th, 2009, 09:58
Chainer Chainer is offline
NAXJA Forum User
 
Join Date: Aug 2008
Location: Michigan
Posts: 36
Re: Rear end wants to slide on dry roads.

They were ordered for an XJ with 3" lift. The fronts seem fine, though they both come very close to bottoming out at flex.

edit: I should add I have trimmed fenders on 31's so I haven't added bumpstop extensions to the front because I don't' rub. The rear needs new bumpstops, but I've only flexed it to find out how much bumpstop I need.
Reply With Quote
  #7  
Old April 8th, 2009, 10:15
3XJFamily 3XJFamily is offline
NAXJA Forum User
 
Join Date: Jan 2005
Location: Austin TX
Posts: 486
Re: Rear end wants to slide on dry roads.

Trackbar.
Reply With Quote
  #8  
Old April 8th, 2009, 11:01
Chainer Chainer is offline
NAXJA Forum User
 
Join Date: Aug 2008
Location: Michigan
Posts: 36
Re: Rear end wants to slide on dry roads.

I'm not sure I get your meaning. Care to elaborate? I do have the stock trackbar, I did not re-drill it, but did get it aligned afterwards. I suppose it could make sense that since it's off-center to the drivers side the shorter stance on the passenger side could make the rear want to come around while turning left.

Is there a way to verify this without buying a adjustable trackbar on a hunch?
Reply With Quote
  #9  
Old April 8th, 2009, 11:58
tomcat's Avatar
tomcat tomcat is offline
NAXJA Member
 
Join Date: Aug 2007
Location: North NJ
Posts: 696
Re: Rear end wants to slide on dry roads.

When in doubt, gas it out. If it doesn't solve the problem, at least it ends the anticipation
Reply With Quote
  #10  
Old April 8th, 2009, 12:24
Chainer Chainer is offline
NAXJA Forum User
 
Join Date: Aug 2008
Location: Michigan
Posts: 36
Re: Rear end wants to slide on dry roads.

Thanks again for the suggestions guys. I'm thinking about redrilling the trackbar and getting it aligned again. I've got a small about of bumpsteer, nothing I planned on doing anything about. Some people have had redrilling the trackbar fix it, but i'm wondering if the trackbar and drag link being farther from parallel might make it worse. What do you think?
Reply With Quote
  #11  
Old April 8th, 2009, 12:40
Kittrell's Avatar
Kittrell Kittrell is offline
NAXJA Member
 
Join Date: Mar 2003
Location: Broomfield, CO
Posts: 11,606
Re: Rear end wants to slide on dry roads.

Quote:
Originally Posted by Chainer View Post
but i'm wondering if the trackbar and drag link being farther from parallel might make it worse.....
Bingo..............
__________________
Reply With Quote
  #12  
Old April 8th, 2009, 12:54
3XJFamily 3XJFamily is offline
NAXJA Forum User
 
Join Date: Jan 2005
Location: Austin TX
Posts: 486
Re: Rear end wants to slide on dry roads.

Quote:
Originally Posted by 3XJFamily View Post
Trackbar.
Quote:
Originally Posted by Chainer View Post
I'm not sure I get your meaning. Care to elaborate? I do have the stock trackbar, I did not re-drill it, but did get it aligned afterwards. I suppose it could make sense that since it's off-center to the drivers side the shorter stance on the passenger side could make the rear want to come around while turning left.

Is there a way to verify this without buying a adjustable trackbar on a hunch?
Trackbar. You said it was aligned but without addressing the trackbar, it can't be correct front-to-rear. It would have been fairly trivial to have re-drilled it so, why not? It wouldn't cost anything?

Also, have someone turn the steering side to side, and go look for loose components (loose trackbar bracket, sloppy steering box, worn out bushings or TRE's). Problems in the front end can easily contribute to a loose feeling when turning.

The low-end Skyjacker shockers will be stiffer than a high quality shock, and will be a large factor in the harsh ride, and lost contact on rough roads. The problem with free parts is sometimes they end up costing a lot.

Honestly - it sounds normal for a rusty 30 year old Jeep with a stiff suspension. . .

Last edited by 3XJFamily; April 8th, 2009 at 12:58.
Reply With Quote
  #13  
Old April 8th, 2009, 12:57
Chainer Chainer is offline
NAXJA Forum User
 
Join Date: Aug 2008
Location: Michigan
Posts: 36
Re: Rear end wants to slide on dry roads.

If I redrill the trackbar and don't adjust he draglink, all it will do is offcenter my steering wheel, correct?

The tires toe in should be 0 degrees, so it should be the same with the axle 3/4 of an inch over. Running it like that for a day shouldn't make anything too unmanageable at least as a test to see if a new trackbar is needed?

If the bump steer gets worse, time for adjustable, if it fixes everything... well then I just fixed everything. Then I'll probably weld some washers on the new hole to keep it from wallowing out.

Edit: Yeah, I never expected the skyjackers to be great, they were a Christmas present because they were on sale for like $120 with free shipping. Like I said, I expect it to ride a bit rough, but in a straight line it rides alright.

Last edited by Chainer; April 8th, 2009 at 13:03.
Reply With Quote
  #14  
Old April 8th, 2009, 14:22
whatevah's Avatar
whatevah whatevah is offline
It's Yellah!
 
Join Date: Oct 2005
Location: Wilmington, DE
Posts: 1,297
Re: Rear end wants to slide on dry roads.

which shocks do you have? Skyjacker has two series, Hydro and Nitro. The Nitro shocks are a lot stiffer.
Reply With Quote
  #15  
Old April 8th, 2009, 15:06
Chainer Chainer is offline
NAXJA Forum User
 
Join Date: Aug 2008
Location: Michigan
Posts: 36
Re: Rear end wants to slide on dry roads.

Hydro 7000.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Rear swaying on certain roads Rockken Colorado Chapter 5 July 15th, 2007 14:22
Rear swaying on certain roads Rockken OEM Tech Discussion 4 July 13th, 2007 08:09
Sideways slide Q's.... Weasel Jeep Street and Performance 28 May 11th, 2004 08:27
Laws on roads? Thru roads? BoiseXJ Non-Tech / Off Topic 7 June 12th, 2003 07:48


All times are GMT -7. The time now is 14:38.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014