The Dart Sport seems to ride really high at the back. The rear shackle is 3.5 inches from bolt center to bolt center. Is this right, or is this a longer than stock shackle?
Oh yeah them booster springs on the shocks will lift it. You can probably remove just the springs from the shocks and lower it unless their some special shocks that don't come apart. In the old days it wasn't uncommon to add booster springs to the shocks to lift the rear when the springs got weak instead of replacing the springs.