Well I am back, with another question. I started looking into why the rear end on my 90 mustang lx 2.3 converted carbbed 5.0 hatchback is sagging. I already replaced springs, started looking and saw atleast the drivers upper torque box is ripped. I haven't checked the others quite yet. So first can ripped torque boxes cause my rear end to sag? Second if they are just slightly torn am I good to weld the seams and weld in reinforcements? I'm just trying to figure out if I should buy replacement boxes if I go ahead doing the repairs, otherwise I might just sell the car. Thanks in advance