Generally, by observation, the rocker panel should be parallel with the flat road surface under the vehicle. The rear end being higher than the front didn't start happening until about the 1990s on some cars.
Before doing any checking, make sure the front end is at the correct ride height (according to the Chrysler service manual) before getting excited about the rear of the car. In some cases, a "band aid" fix would be to put some quality air shocks on the rear of the vehicle. Putting about 40psi in them will probably level things up and then you can get an idea of how it should be if everything is up to spec. The air shocks usually are less expensive than spring work and definitely take less labor to make happen.
If you look at the factory service manual and also some factory sales brochures, you can get an idea of what the vehicle was supposed to "sit like". Then, you can take a floor jack and jack up the rear bumper to where it matches what's in the sales brochure. Take measurements at the wheel opening before and after.
Once you know how "low" the rear end ride height might be, give that information to the spring shop so they can rebuild your existing springs to get things back on a level situation and in factory specs.
Back to the Home of the Forward Look Network