You may very well NEED both the LCAs and a UCA to be adjustable, if you're trying for a specific axle location with respect to the wheelwells/sheetmetal AND trying to set a particular pinion angle. Depending on how fussy you are about this, you may be in for some "back and forth" adjusting between the lowers and the upper.
Adjusting the length of either the LCAs or the UCA will affect wheelbase.
LCA adjustment can also be used to get the axle square in the chassis. That also means that you can knock an axle that's already square to the chassis out of alignment if you aren't careful.
Norm
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08 GT Premium Black/Light Graphite, stick, un-FStock weenie-EP 626/V6/stick, Prepared just enough, sometimes
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