Hotchkis Sport Suspension 30390 1963 - 1972 Chevrolet C - 10 GMC C15 Truck Rear Anti Squat Bracket System. Improve the cornering performance and traction of your 63 - 72 C - 10 Pickup with the Hotchkis Sport Suspension Anti Squat Bracket System. This kit includes Precision Laser Cut CNC Bent Brackets with 4 positions for tuning the trucks anti squat characteristics for improved launches increased traction and added power out of the turns. The kit is a direct bolt in system and comes complete with Billet differential wedges for pinion angle changes. Finished in gloss black powder coat this system is a direct bolt in and will improve any C - 10 trucks performance. Note This system only works on coil spring models.