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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | It's actually a caster shim. It sets the caster setting of the axle, which the the angle from vertical that the spindle site. Very important to maintaining stability and tracking. Best would be to take it to a competent alingment shop (one that will actually do modified vehicles) and have them set it to the correct angles. You will most likely have to have the toe reset as well.
Bill Burmeister
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