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Caster is adjusted on ’65-’66 Mustangs and ’60-’65 Falcons and Comets by changing the number of shims on the upper control arm. If you have more shims on the rear bolt than you have on the front bolt, the upper ball joint is moved forward, which moves the wheel/spindle forward. If you have more shims on the front bolt, this moves the spindle aft. The strut rod is a fixed position part for ’65-’66.