[Hib Halverson]

With respect to rear trim height, the first thing to do is get under the car and inspect the rear spring mount.

There may be metal "shims" either above or below the rear spring. To have the lowest ride height with the most suspension travel, the first thing to do is make sure all the shims which are there are below the rear spring. You don't want any above the spring and you don't want a mix of shims above and below. You want them all below the spring. Do not remove the shims. Just make sure they're all on the bottom.

As for rear spring bolts, keep in mind that long, grade-8 bolts from generic bolt suppliers (Fastenal, Granger and etc) may lack one important feature that some of the C4-specific lowering kits sold by Zip Products and other Vette parts vendors have and that is the bolt being threaded for a uncommonly long distance. Having 3 or 4 inches of threading on the bolt gives you trim height adjustabillity which you can't get with a bolt having an inch or an inch-and-a-half of thread.

With C4, suspension travel is limited to begin with on those cars. For street use, a little lowering can be desireable but a lot of lowering is going to make for two problems 1) lack of rear ground clearance and 2) lack of adequate suspension travel at the rear.

Finally, I have found with "Barney," my '95, that having proper adjustable rear spring bolts is really nice when the car is loaded up to the max with two people and cargo for a long road trip. For many years my standard procedure before the Wife and I load up for a long trip is to use the spring bolts' adjustability to raise the rear of the car half an inch or so. Once we, all our gear and a fuill tank of fuel are in the car, it will sit level. Not only does that insure adequate suspension travel at the rear (and the ride comfort which comes with that) during the trip but, if the trip involves night driving, it's preserves headlight aim.