I had a tie rod end go bad in my W350. I replaced it, and turns out I didnt get the TRE in as far as the other one. My wheel was off center, but it wandered like a drunk sailor on shore leave, too. I measured the toe, and it was actually toed OUT about 1/4". I adjusted the toe so it was toeing in about 1/16", and it now tracks straight and true.
Mark the center of your tires, and get a helper to measure the distance between the centers. The front should be closer than the rear (toeing IN). I dont know how much difference there should be, I just took a reasonable guess on mine and will do the math, converting degrees to inches someday.
I would check everything under the truck and look for bent stuff. These trucks are tough, but not quite bullet proof.
Daniel
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92 W350 xcab LE, 5spd, 3.54s pump tweaks, piston lift pump, 60mm/ 16cm turbo. plain tailpipe with muffler. For sale