what are the difference in the rear spring rates of a vin e sport coupe/rs vs., say an iroc or a z28 (non 1le)? My rear end feels like its supported by slinkies and im tired of it bottoming out so i want to get some new rear springs to replace them. Im flat broke so anything aftermarket that is halfway decent is out of the question.

 

You can do pretty well with the take-off rear springs SLP sells for $20 or so, they're from new 4th gens with < 10 miles on them and drop right in. Spring code on the ones I got were TTJ if that helps.

Check out http://www.slponline.com/ and dig around.