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The shims perform 2 functions, one is to center the knuckle on the axle so the inner axle is centered on the inner axle seal, the other is to provide the bearing preload for the trunion bearings. The centered axle shouldn't mess with your steering much, inner axle seals may give out sooner though. If you have too many shims and the trunion bearings are loose it could act like the bearings are wore out and could cause handling issues. If you jack up the front tire and grab it top and bottom and see if there is any play. If there is make sure the play isn't isn't your wheel bearings, that could cause problems too.
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