The upper shock x-member isn't very strong. It's only spot welded to the frame rails in a couple spots. If a car has had air shocks for awhile, you'll see that the x-member breaks it's welds and separates from the frame. The proper thing to do is replace the sagging springs and install a standard style shock. A cheaper alternative to brand new springs, is adding an extra leaf to your existing spring pack. The choice is up to you depending on your budget and mechanical ability.
