If you bought 2G FWD or 7G springs and have too much weight in the rear it will sag. If you have more weight than OEM in the rear then you should have bought GSX springs as the sit a little higher in the rear. Anything like tools or a system could cause it. I would call or email the vendor who you bought them from since that is a huge problem. What are the part numbers on the springs? If you come to the MidATL BBQ I'll take a look at the setup for you.
7G Eibach Pro Kit and KYB GR2 on my old GS with some tools, spare, 2 12's in a sealed box. Kolio has the suspension now so there is plenty of miles on them with no sagging problems.
2G FWD Eibach Prokit and Tokico Illuminas set to 3 all around with atleast 50 lbs of tools, heavy ass bandpass box plus the spare. It sags very little with all that, once I take my tools out it raises back up some.
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