Torque Box Reinforcement Plate Kit (TBR005 And TBR003)Increase stiffness and reinforce the torque boxed in your 1979 2004 Mustang with Torque Box Reinforcement Braces from BMR Suspension. The Fox chassis Mustangs we not known for being super strong. When large amounts of torque are applied to the Fox chassis, the factory torque boxes are known to crack and rip. This causes all kinds of rearend alignment issues, poor performance, and unsafe driving conditions. Designed from CNC laser cut, CNC formed steel