The Detroit Speed anti-squat kit provides instant center and pinion angle adjustment on the rear suspension of 1967-1972 GM C10 trucks (fits factory rear suspension with truck arms and coil springs). The front truck arm relocation brackets provide four pivot point options to adjust the instant center & tune anti-squat for improved traction and acceleration exiting corners. Pinion angle/lowering spacers provide ride height and pinion angle adjustability. The slotted design of the pinon spacers allows for easy installation. 100% bolt-on installation.