Is that height with the fluids, etc. in the car? If so, I would agree with Tech....the Corvette is fine with the 4" clearance. Actually, it is the clearance plus where the clearance is relative to the axles....if the minimum clearance is half way between the axles, you could drag on a speed bump. If the minimum clearance is at the axle, you would go over the speed bump. I'd say test the thing on a driveway entry and learn the limitations....if in doubt, make it lower.

Also, learn not to straddle dead armadillos laying in the road.

mike in tucson