These SPC I.H.C./Navistar torque arm shims are sold six per box and are intended to alter thrust angle and toe when installed between the torque arm and spring hanger. On Navistar applications they can also help center the axle with the frame rails when used on the lateral link. They provide a simple, serviceable way to achieve alignment corrections on compatible heavy-duty vehicles.
SPC Performance TANDEM SHIM-IHC 1/8 (6)