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  1. Replaced Upper and Lower Ball Joints, Now Pulls Hard to the Right?

    S10 / S15
    My truck is a 1991 s10 4x4 and I'm trying to understand this. The mechanic claims to have not touched the tie rods, only replaced the upper and lower ball joints. Now the truck pulls hard to the right. It went pretty straight before. Am I missing something here? What would cause that...