Hello, I've been searching your site but can't find my answer.
My samurai is spua on 3" trail gear springs with lift shackles, on 32's. A few days ago, I removed a Calmini shackle reversal setup and installed new spring bushings and lift shackles in the front, and shackles in the back that are about 3/4" longer that what was on it. I also installed caster shims on the front axle with new u bolts. After all this, I test drove it several miles at highway speed and it drove great. No issues whatsoever.
The following day I replace the knuckle ball wiper seal with the Trail Gear "Trail Safe" wiper seal kit. This involved removing kingpin bearings, which I inspected, re-packed and reinstalled with the same shims. The hub was stiffer to turn with the new seal on, but everything seemed to go together fine. Knuckle has no play when I finished.
After that, I drove it and had to fight to keep it on the road at highway speed. When accelerating it pulls moderately to the left, on deceleration it dives hard to the right. This makes sense with the geometry of the drag link and suspension movement but not to that extreme. What could possibly cause a difference from before and after I did that knuckle wiper seal?
Similar to this thread but there is no definitive answer.