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Unread 12-16-2008, 06:38 PM   #1
dz1087
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Torque Steer

What Causes it and How do I get rid of it?

Back story:
My rig's been pulling left for about a year and a half. It has really been bothering me lately and I have been trying to fix it. So I got a used set of LCA's, thinking my left side was bad and thus allowing the left wheel base to shorten under acceleration. I changed out the left one and it did the same thing. I then swapped the left with the right, and vice-versa. Well, it still does the same thing.


When I pulled the right side though, the axle went back about a half inch and I had to jack the right side up in order to line the holes up to bolt it back in. The left side just sat right in place, didn't have to move it at all. Could this be telling me something about my problem, like a bad UCA or shock, or???

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Unread 12-16-2008, 06:46 PM   #2
Pillswoj
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Bad rear tackbar bushing will cause torque steer too.

Not shocks normally, but any of they bushings in the upper and lower arms as well as the trackbar are what stabilizes the axle and torque steer is the rear axle shifting under acceleration
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Unread 12-16-2008, 06:59 PM   #3
LJ_Cool
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Have you measured the distance between your hubs front to back to ensure they're evenly spaced?

It was almost impossible to get my older JGC to track straight, and it turned out that one side was just wore or adjusted so poorly that the wheelbase was about an inch shorter on one side.

I would check the play in your rear axle too, it's where the main driving thrust is provided, and if it's jimmying to one side under power it will cause you to veer.

Generally, torque steer is more noticable on FWD cars, and is typically caused because the centerline of tire, is not the same as the centerline where the front wheels pivot when turning. A tire on one side will have more traction, and thus cause the tire to pivot the whole steering system when under stronger acceleration.
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Unread 12-16-2008, 07:13 PM   #4
Pillswoj
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Quote:
Originally Posted by LJ_Cool View Post

Generally, torque steer is more noticable on FWD cars, and is typically caused because the centerline of tire, is not the same as the centerline where the front wheels pivot when turning. A tire on one side will have more traction, and thus cause the tire to pivot the whole steering system when under stronger acceleration.
Actually "torque steer" may not be the best term, I call it "rear steer". When the bushings in my rear trackbar were shot the jeep would pull left if you were on the gas and then pull left when you took your foot off the gas. It is very noticable and is caused by the rear axle moving with the torque of acceleration.
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Unread 12-16-2008, 08:02 PM   #5
dz1087
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Quote:
Originally Posted by Pillswoj View Post
Actually "torque steer" may not be the best term, I call it "rear steer". When the bushings in my rear trackbar were shot the jeep would pull left if you were on the gas and then pull left when you took your foot off the gas. It is very noticable and is caused by the rear axle moving with the torque of acceleration.

Correct, but evidently it is not my LCA's, so I'm wondering what else it could be.
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Unread 12-16-2008, 08:09 PM   #6
Kpat
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Quote:
Originally Posted by Pillswoj View Post
Bad rear trackbar bushing will cause torque steer too.
X2 on the rear track bar
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Unread 12-16-2008, 08:13 PM   #7
Pillswoj
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Quote:
Originally Posted by dz1087 View Post
Correct, but evidently it is not my LCA's, so I'm wondering what else it could be.
Have you inspected the trackbar bushings? do you have a relocation bracket on the trackbar, they can also loosen.
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Unread 12-16-2008, 08:21 PM   #8
dz1087
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I'm bone stock on the suspension. How could I check the bushings on the trackbar?
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Unread 12-16-2008, 08:42 PM   #9
Pillswoj
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properly you would have to remove the trackbar to inspect then make sure you torque to spec.

However, while you are looking underneath the jeep at the trackbar, have someone push the back of the jeep side to side and see if there is movement at the trackbar ends.
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Unread 12-16-2008, 08:46 PM   #10
dz1087
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I'm still not seeing how this could cause the left side to get closer under acceleration.
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Unread 12-16-2008, 08:46 PM   #11
dz1087
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Should I be considering poly bushings for everything back there?
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Unread 12-16-2008, 09:24 PM   #12
Pillswoj
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Quote:
Originally Posted by dz1087 View Post
I'm still not seeing how this could cause the left side to get closer under acceleration.
If the trackbar bushings are shot, it allows the axle to move side to side when accelerating, this will cause the jeep to veer left when accel. and right when you let off the gas. (I could have that backwards it was over a year ago when I had the problem) .

Since you tried replacing LCA the trackbar becomes the prime suspect. The upper control arms arm more for control of axle wrap.
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Unread 12-17-2008, 06:43 AM   #13
mdm
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Quote:
Originally Posted by Pillswoj View Post
...it allows the axle to move side to side when accelerating, this will cause the jeep to veer left when accel. and right when you let off the gas...
I had this problem with shot upper control arm bushings.
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Unread 12-17-2008, 04:58 PM   #14
dz1087
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Quote:
Originally Posted by Pillswoj View Post
If the trackbar bushings are shot, it allows the axle to move side to side when accelerating, this will cause the jeep to veer left when accel. and right when you let off the gas. (I could have that backwards it was over a year ago when I had the problem) .

Since you tried replacing LCA the trackbar becomes the prime suspect. The upper control arms arm more for control of axle wrap.
Quote:
Originally Posted by mdm View Post
I had this problem with shot upper control arm bushings.
OK, I'm trying not to replace everything if I don't have to. So what would be the most likely suspect, and how would I check? If I swapped the UCA's, and they are in fact the problem, would it pull tot the right instead?
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'99 XJ, Purple, Stock but with new wheels.

Running Doorless? Check your state's Mirror Laws!!
http://www.jeepforum.com/forum/showthread.php?t=565361

There can be no fifty-fifty Americanism in this country. There is room here for only 100% Americanism, only for those who are Americans and nothing else.
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Unread 12-17-2008, 05:11 PM   #15
Pillswoj
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Quote:
Originally Posted by Pillswoj View Post
properly you would have to remove the trackbar to inspect then make sure you torque to spec.

However, while you are looking underneath the jeep at the trackbar, have someone push the back of the jeep side to side and see if there is movement at the trackbar ends.
Quote:
Originally Posted by dz1087 View Post
OK, I'm trying not to replace everything if I don't have to. So what would be the most likely suspect, and how would I check? If I swapped the UCA's, and they are in fact the problem, would it pull tot the right instead?
Again, either you take things off and inspect or have someone try to shove the rear of the jeep side to side while you check for movement .
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