Ridetech 11337199 63-72 CHEVY C10 REAR STRONGARM SYSTEMRidetech 11337199 63 72 CHEVY C10 REAR STRONGARM SYSTEM The Ridetech rear StrongArm system replaces the stock trailing arms or leaf springs in 1963 1972 Chevrolet and GMC C10 trucks. It works with either Coil Over or Shockwaves and offers a 6 drop at ride height (up to 10 fully deflated w ShockWaves). Increased compression travel, corrected pinion angle and superior shock absorber technology provide dramatic improvements to handling and comfort. The