If you have raced your Mustang aggressively, on slicks, or even on the street and especially if your car is a 5-speed, you may have cracked torque boxes. Fox bodies don't have the best chassis to begin with, combined with a V8 and some torque, and you are going to have problems. That is why lower control arm reinforcements or torque box reinforcements were designed to reinforce weak and cracked torque boxes (front lower control arm mounting point).

This Part Fits:

Year	Make	Model	Submodel
1994-2004	Ford	Mustang	Base
1994-2004	Ford	Mustang	GT
2001	Ford	Mustang	GT Bullitt
1995	Ford	Mustang	GTS
2003-2004	Ford	Mustang	Mach 1
1994-1999,2001,2003-2004	Ford	Mustang	SVT Cobra
2003	Ford	Mustang	SVT Cobra 10th Anniversary
1995,2000	Ford	Mustang	SVT Cobra R