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Front control arms allow your suspension to travel up and down. There are lower control arms, and upper control arms. 1982-1992 models do not use an upper control arm. When replacing control arms, a wheel alignment should be performed. On 1981 and older models, front wheel alignment is performed by adding and/or subtracting shims between the upper control arm and chassis. On 1993-2002 models, the lower control arm is adjusting by moving the mounting bolts as necessary.