I don’t see anything on the alignment sheet that would cause it either. Just looking for what else might have changed.
Can too much toe-in cause bump steer?
- Thread starter akajibio
- Start date
Check your tire pressure, they might have jacked it up. Your 35" BFG tires should be around 24 psi when the Jeep is lightly loaded, no more than around 26 psi when the Jeep is heavily loaded.
Bump steer is when the steering is 'bumped' left/right when you drive over bumps/dips in the road. Wandering left-right while you drive on a smooth road or highway is not bump steer.
@akajibio drawing your attention to the below additions...
One more thing that can cause/affect bump steer is when the amount of drop the Pitman arm has is different from the driver's side track bar mount. Your Pitman arm has a much deeper drop than you aftermarket dropped track bar bracket has. Your Pitman arm has a high amount of drop, I'd either replace it with one with a bit less drop, or go back to the factory Pitman arm and get rid of that dropped driver's side track bar mount.
Finally, what is your current caster angle?
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The drop bracket for track bar is now welded so that’s going to stay. I can try to get a different pitman arm with less drop! Any suggestions as to which one to get? Website? Links? Also the caster is …..
Your 6.3-6 caster angle is fine, that much caster would cause very stable steering.
Exactly (!) what is your current tire pressure?
As above, that's excessive for a 35x12.50 tire when carrying a Wrangler. Drop them down to 24 psi if your Jeep is not heavily loaded and see if that helps.
X2. The aftermarket frame side track bar attachment and dropped pitman arm jump out at me as well. I know you said these aren't new, but sometimes another change (like different tires) can make other issues more noticeable. I would measure the ground to center heights of both ends of the drag link and track bar. The difference in that distance for each piece should be very close (drag link can be a little more because its longer). If they aren't within an inch, that is a likely bump steer cause as they aren't parallel.
Jerry as always thank you for all your input. I will air down to 24psi tonight and see how she does. Also, do you think I should upgrade to 9/16 bushing and bolt for front track bar to frame mount? I’ve already upgraded bushing on track bar to axle
Yes but he confirmed he's not experiencing symptoms that define as bump steer. If he was I'd push harder for those drops to be removed.
Yeah it’s mostly on the freeway with speeds above 50 when I feel the left to right to left feeling
The readings I see on the alignment read out do show 6.3-6 caster angle which would be fine, IF that's really what his TJ has.
Looking at the camber read out both of those tires are leaning in 3/8 of an inch or maybe more.
-0.9 degrees
X .017 inch per 1 degree
X 25 the distance I used between where the sidewalls of the 35 inch tire bulges out
= -.3825 inches
To me if that read out is correct that TJ would have a problem that I'd call a rice burner stance.
No I think the alignment read out isn't accurate on anything it says. It can't be wrong somewhere and correct somewhere else.
Or maybe both of your tires are leaning in?
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