blistovmhz
NAXJA Forum User
- Location
- Vancouver, BC
98XJ, 5.3/4l65e, 6.5", long arm (radius), 63" rear leaf, 1 ton x-over, WJ knuckles, 1.5" ram, 35x10.5 KM2 .
Been chasing this left pull for goddamn years now. It's survived several complete rebuilds, but I think I may be honing in on it now.
I used to think it was just a little bit of torque steer, as it'd pull left on acceleration and right on deceleration.
This started long before the 5.3 swap, 63" leafs, 1 ton steering, WJ knuckles, and the ram assist so I'm confident none of those are the cause.
I recently stuck a ram in front and got it all dialed in, and now the pull is worse, which sorta doesn't surprise me because the pre-existing pull would be forcing the pitman toward driver, which is now sending feedback to the ram, so the pull is even stronger.
With Jeep up in the air, engine running, the wheel does not start moving by itself, so it's not a steering box or ram issue (besides which, this problem survived 3 steering boxes now, including my durango box).
As I have nothing really left to "upgrade" at this point, I've started looking back into the pull. Last night I checked all alignment numbers again. I found that the caster was 4* out on the driver side (which didn't surprise me) so I adjusted the uppers to force it within a degree. Caster is now bang on where it should be on both sides. No change. Set toe to 1/8. No change.
I've noticed that my rear tires are wearing unevenly. The driver tire always wears faster than passenger. A few months ago I first noticed this, and swapped the fronts to the rear and the pull decreased or maybe even went away, so last night I swapped the rears side to side, but no change.
I measured wheel base both parallel and diagonally and numbers were within' 1/16 in every direction, but then I had a thought. I was measuring from the tire, and some tires are worn. It's entirely possible my measurements were only correct because one tire was worn more than the other side. Then it occurred to me that when I disconnect my sway bar and pull the arms down when pulling the pitman, the arm on the driver side hits the coil, but not on the passenger side. Just looking at the coil vs the bump stop, the driver definitely looks like the axle is farther forward than the passenger side. This would make perfect sense to me if it was the other way around. I figured the driver being further forward, would cause a RIGHT pull, not a left, but I figure this is the only thing that looks to be out of spec.
Before I go pull the front end apart again and push the passenger side forward or bring the driver side back to match, who here thinks that the driver being FORWARD of the passenger, would cause a LEFT pull on accel and while cruising, and a SLIGHT RIGHT pull on decel? (intuitively that seems backwards to me due to thrust angle).
Been chasing this left pull for goddamn years now. It's survived several complete rebuilds, but I think I may be honing in on it now.
I used to think it was just a little bit of torque steer, as it'd pull left on acceleration and right on deceleration.
This started long before the 5.3 swap, 63" leafs, 1 ton steering, WJ knuckles, and the ram assist so I'm confident none of those are the cause.
I recently stuck a ram in front and got it all dialed in, and now the pull is worse, which sorta doesn't surprise me because the pre-existing pull would be forcing the pitman toward driver, which is now sending feedback to the ram, so the pull is even stronger.
With Jeep up in the air, engine running, the wheel does not start moving by itself, so it's not a steering box or ram issue (besides which, this problem survived 3 steering boxes now, including my durango box).
As I have nothing really left to "upgrade" at this point, I've started looking back into the pull. Last night I checked all alignment numbers again. I found that the caster was 4* out on the driver side (which didn't surprise me) so I adjusted the uppers to force it within a degree. Caster is now bang on where it should be on both sides. No change. Set toe to 1/8. No change.
I've noticed that my rear tires are wearing unevenly. The driver tire always wears faster than passenger. A few months ago I first noticed this, and swapped the fronts to the rear and the pull decreased or maybe even went away, so last night I swapped the rears side to side, but no change.
I measured wheel base both parallel and diagonally and numbers were within' 1/16 in every direction, but then I had a thought. I was measuring from the tire, and some tires are worn. It's entirely possible my measurements were only correct because one tire was worn more than the other side. Then it occurred to me that when I disconnect my sway bar and pull the arms down when pulling the pitman, the arm on the driver side hits the coil, but not on the passenger side. Just looking at the coil vs the bump stop, the driver definitely looks like the axle is farther forward than the passenger side. This would make perfect sense to me if it was the other way around. I figured the driver being further forward, would cause a RIGHT pull, not a left, but I figure this is the only thing that looks to be out of spec.
Before I go pull the front end apart again and push the passenger side forward or bring the driver side back to match, who here thinks that the driver being FORWARD of the passenger, would cause a LEFT pull on accel and while cruising, and a SLIGHT RIGHT pull on decel? (intuitively that seems backwards to me due to thrust angle).