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If you do the math on the shims you get about 1°. Last year I installed the steeroid System to get power steering, they do not recommend more than two shims per side. Two shim's should give you approximately 2°.
use as many shims as you need to get to where you need to be...
. . Ok, Getting a lot better understanding about these things. . Saw the GM part number and checked a bit more and found these shims are a standard part of the cross member mount. . Looked closer at mine and each side has one. . . . Been talking with a Corvette shop in Denver (Corvette Connection) and he said neither he nor his C1 customers had any idea what I was talking about until I forwarded the Corvette Central page to him. . . . So how many shims did you have to stack to eventually be able to get the positive 2 caster ? ?
I have 4 shims New never installed, if you are interested i'll sell all 4 for $70 plus shipping. I know you may have already purchased, but thought i would give it a shot.
. . Thanks but you are right, I just received them. . Found a couple sellers on ebay that sell the same parts that are in the corvette catalogs at a much better price. .