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Anyone have part#'s for wagon rear uca's? GM partsdirect shows +2 degree pinnion nose angle and -2 and 0 degree. Which one would the wagon use? Thanks Ed
 
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I believe those were to finetune the pinion angle per car not across a body style. It is too costly to build something like a chassis and axle to exact specs so all cars would use one upper control arm for the right pinion angle, in order to make then mesh together well GM just make a few different choices for the link between them.

I am sorry that does not help you pick one but at least you know why there are several and hopefully that helps you solve the problem.
 
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Thanks,it turns out I don't have to change them.
 
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