Replacing body bushings is a real moment of truth for your car. Its when you realize its true condition. The rubber body bushings can look fine on the outside but be completely rotted out on the inside, you can't tell until you pull the bushings out. Bad body mount bushings can cause stress cracks in the body. Then there are other issues such as broken body bolts, frozen body bolts, free spinning caged body bolts, rusted out frame mounts, rusted out body mounts. I prefer the poly body mount bushings as they lack molded in metal inserts that can rust out leaving the bushing hollow and rust damage the frame mounting hole.