[Starman]

I thought I knew a fair amount about these cars having owned 6 C4s, but am stuck on this one. This is a 1991 ZR1 with about 54K miles. The rear spring was replaced about 8 years ago with a Hyperco unit, the shocks were replaced about six years ago. The rear suspension was rebushed with urethane when the shocks were done. The rear of the car has the adjustable ride height bolts, but is out of level from side to side about 1/4" - this is with the drivers side cranked all the way down to raise it and the passenger side run out almost all the way to lower it - the passenger side is still high. Two different dealer body shops checked the frame and claim it is straight. When full raised, one of the rear tires does not drop as far as the other but need to verify which one. Looking for ideas on what could be binding, this seems too simple to not have figured out yet. Thanks