Thanks Brad,
I'll call around next week looking for a shop with the 9700, to get the tire rebalanced. I also picked up a set of GM Grand Sport/CE rims with tires and want to ensure they are balanced before putting them on.
Jason,
I hope we found our problem with the shudder. I think I will be getting my Vette aligned too. Firestone offers a lifetime alignment and I feel it's worth the money. The shop in my area has been great to me in the past. Considering that I off-road my Grand Cherokee, the front alignment can easily be knocked out of alignment on harder trails, the lifetime alignment has paid for itself already.
And the fact that I will own this Corvette for a LONG time, it will be worth it.