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  #1  
Old October 12th, 2020, 15:21
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techno1154 techno1154 is offline
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One wheel bounce

Driver side front wheel,...I am out of options.

New Bilstein 5160's
New unit bearings,
New Chevy TRE,
New ball joints,
Check and re-check all fastener torque.
All new tires balanced and re-balanced.

Just that one side have a continuous bouncing when driving on some of these newish concrete road that is not very smooth at high way speed. It does display a mild case of death wobble at times.

For brakes the XJ is fitted with a set of WK (third generation Grand Cherokee 2006 model) rotors and calipers. The calipers are a bit warped. I have a replacement set but need to drill a second set of bolt holes at 4.5 inch instead of the 5 inch spacing.

Funny thing, I could drive up to 80 MPH on otherwise smooth highway with no indications of a shake or wobble. I am out of things to look at except a professional alignment.
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#594
1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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  #2  
Old October 12th, 2020, 15:28
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Vince Vince is offline
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Re: One wheel bounce

For a process of elimination you could try swapping the Bilsteins over from left to right and vice-versa.
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  #3  
Old October 12th, 2020, 15:49
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techno1154 techno1154 is offline
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Re: One wheel bounce

Quote:
Originally Posted by Vince View Post
For a process of elimination you could try swapping the Bilsteins over from left to right and vice-versa.
I had the same problem with a different set of shocks. I also swapped the wheels front to back on that side.

The other item of concern is the 2" spacers/adaptors on all four wheels that allow the use of the JK OEM 17" wheels. I should start swapping them around also.
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#594
1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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  #4  
Old October 12th, 2020, 16:59
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WAZZUXJ WAZZUXJ is offline
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Re: One wheel bounce

Is the axle centered? Trackbar geometry and length correct? Trackbar mounts solid? Alignment done?
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  #5  
Old October 12th, 2020, 17:09
RCP Phx RCP Phx is offline
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Re: One wheel bounce

What tires? Sometimes they have to be "trued" before you balance them.
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  #6  
Old October 12th, 2020, 21:33
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Re: One wheel bounce

Quote:
Originally Posted by RCP Phx View Post
What tires? Sometimes they have to be "trued" before you balance them.
Something that has been lost over the years, the good tire guys will check for round before they ballance.

Look at your front axle U-Joints, grease or even rust dust around the rubber seal for the bearing caps. Jack the tire/axle up and jam the U-joint yoke with a long ratchet drive extension or something similiar. Look closely with a flashlight where the X goes into the bearing caps.
I had one that showed none of the normal signs of U-joint failure but it would pick up a serious vibration or bouncing sensation at around 50 MPH and then it would disappear or minimize at higher speeds or lower speeds.
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  #7  
Old October 14th, 2020, 08:56
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Re: One wheel bounce

Thanks all for their reply.

I walked backward in my mind of the things I did recently that would affect drivability. Toe adjustment was the last one a couple of weeks ago. It was toed out and sowed signs of it with tire wear on the inside. When I pulled the toe in a little there was a noticeable improvement in eliminating wandering on slanted roads. Two days I returned the toe to where it was. Now the bouncing seem to be gone and the beginnings of Death Wobble. However, the following the down slope in the road have returned which necessitate a constant but light correction to the left.

It seem I have no choice but to take it to a pro to get it aligned. Enough of that drive way, eyeball, trades man level thing.
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#594
1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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  #8  
Old October 14th, 2020, 09:05
RCP Phx RCP Phx is offline
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Re: One wheel bounce

Are you scribing your tires so you get a good measurement?
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  #9  
Old October 14th, 2020, 09:37
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Re: One wheel bounce

I tried multiple times to do an alignment with the tape measure, but could never get it dialed in just right.

I then used the string method, but instead of a string I used a construction laser level. It was so easy and the Jeep now tracks perfect.
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  #10  
Old October 14th, 2020, 14:58
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techno1154 techno1154 is offline
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Re: One wheel bounce

Quote:
Originally Posted by RCP Phx View Post
Are you scribing your tires so you get a good measurement?
No, there is no sign of tire scrubbing except that over more than 1000 miles the inside of the tire seem to wear more than the outside. The pull to the right is my biggest concern.
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#594
1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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  #11  
Old October 14th, 2020, 15:00
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techno1154 techno1154 is offline
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Re: One wheel bounce

Quote:
Originally Posted by WAZZUXJ View Post
I tried multiple times to do an alignment with the tape measure, but could never get it dialed in just right.

I then used the string method, but instead of a string I used a construction laser level. It was so easy and the Jeep now tracks perfect.
How do you do that? What does the light shoot at?
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Patrick

#594
1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.
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  #12  
Old October 14th, 2020, 15:17
RCP Phx RCP Phx is offline
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Re: One wheel bounce

Quote:
Originally Posted by techno1154 View Post
No, there is no sign of tire scrubbing except that over more than 1000 miles the inside of the tire seem to wear more than the outside. The pull to the right is my biggest concern.
"Scribing" as in with a sharp scribe!
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  #13  
Old October 14th, 2020, 18:42
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Re: One wheel bounce

Quote:
Originally Posted by RCP Phx View Post
"Scribing" as in with a sharp scribe!
No, I did not.

For some reason, I have a feeling the truss angle may be off. I cannot say why I think so except like I said the XJ need a constant but slight left input on the steering wheel to keep her going straight down the road.
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Patrick

#594
1996 XJ; 4.0L; AW4; NP231; SYE; D30 and D44; ECTED; 4.10 gears; 30X9.5 -15 BFG/AT/KO; 3" lift; Rusty's LCA; JKS ADJ UCA; Kevins ADJ Track bar; Drawtite Front Receiver; Dual Electric Fans; Dual Battaries.

Last edited by techno1154; October 14th, 2020 at 18:47.
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  #14  
Old October 14th, 2020, 18:57
RCP Phx RCP Phx is offline
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Re: One wheel bounce

Camber is a whole different conversation?
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  #15  
Old October 14th, 2020, 19:12
lawsoncl lawsoncl is offline
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Re: One wheel bounce

Quote:
Originally Posted by 8Mud View Post
Something that has been lost over the years, the good tire guys will check for round before they ballance.
and the lazy ones don't check the runout to see if you have a bent rim or bad tire.
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