I NOTICED THAT MY REAREND IS ABOUT 1.5 INCHES TO ONE SIDE CAN THE BUSHINGS BE THE CAUSE OR COULD IT BE THE CONTROL ARMS AND WHAT IS THE BEST WAY TO FIX IT ALL ALSO SHOULD I WELD THE BOXES AT THE SAME TIME
Replace rear bushings. Problem solved. New control arms are a nice upgrade with poly bushings but depends if you plan on racing the car or not for it to be worth it.
If not, new rubber bushings will do the job and still keep good ride quality. Also the cheapest route.