Quote:
Originally Posted by mscot
Thanks for the quick replies.
I thought alignment adjustments were done at the LCA.
if the LCA was locked into place (alignment-wise) wouldn't new UCAs not have an affect until they're adjusted?
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Caster angle is determined by the geometric relationship between the ball joint locations on the lower and upper control arms. Lifting the truck changes this relationship and reduces the caster angle. Adjusting the lower control arm eccentric cam bolts can regain some, but not all, of what was lost by moving the lower control arm ball joint slightly forward.
Aftermarket upper control arms move the upper ball joint location rearward compared to stock. This results in increased caster angle -- usually about 2 degrees, as pointed out above -- even if the LCA adjusting bolt settings aren't touched.