My dad just bought a 1969 Firebird 350 2bbl hardtop that we have a problem with it sitting unevenly, mostly noticeable in the rear. When we got it the drivers rear tire would scrub over most bumps. After looking and seeing how worn out looking the springs were, and that the previous owner had put some sort of helper springs on it, we decided to purchase a set of John R Springs. After getting them and only replacing the drivers side it was apparent that there was still a problem, and after a few days settling, it was bad enough that we decided to put a set of lengthened shackles on it, but it seemed the height was the exact same. Before we even put the passengers side on, we decided to send them back that they must be weak as they appeared to be almost flat despite coming with a pretty good arch. We removed them, sent them back figuring that they were just cheap springs. We replaced the factory for the time being and now even with the lift spring it was actually sitting on the tire. So we called year one, they told us that they sold Detroit Eaton springs, and figuring it was year one, they should be good. Today we put the drivers on again, and started it off on the lift shackle which is about 4 inches of lift, and its still sitting at basically the same exact height. One thing to ad is that the wheels currently on it are wider and sit out enough that when its low it is actually hitting the fender lip. We are just at a loss for how such a simple system can be causing so much trouble while the passengers side always sits higher than a brand new spring, and the car still appears to sit towards the rear. Please HELP! We're tired of not being able to drive such an amazing car. Thanks for any information.