I had a similar issue with mine even after new coil springs. So I added firestone ride-rite air bags. Lifted up the rear and improved the ride big time. I installed them myself in about an hour. Part number 4135
Hello, I’m new to the forum as well. I had really bad body roll in the rear. Even after replacing the shocks and putting brand new springs on. I put Firestone Ride-rite 4135 air helper spring kit. Aired them up and my problem is gone. I can also carry extra weight in the rear without sagging...