S-chassis Rear Drop Knuckles. Forged steel and CNC machined. ~ TRUE 25mm drop allows you to set a lower ride height ~ 25mm roll center correction improves handling on lowered cars. ~ Reduced camber and toe gain on compression due to improved control arm angle in order to improve traction and have even tire wear. ~ Low torque teflon lined maintenance free spherical bearings eliminates old worn stock bushings and allows smooth suspension operation. ~ Compaitble with Dual Z32 calipers, drum parking brake, and Z32 rotor. ~ Wilwood hand brake caliper can be used with OEM S-chassis foot brake caliper with parking brake / OEM s-chassis rotor *cut off Z caliper mounts if using wilwood caliper. ~ Compatible Wilwood dynapro billet dual piston hand brake caliper part#120-9689 & 150-9765k *Conforms to Formula D rules for suspension and independent secondary brake system *Compatible with all OEM and aftermarket arms, rods and coilovers however the MAX 2015+ RUCA is needed when using larger than original CV axle joints. We recommend our RUCA for maximum CV boot clearance. *Compatible with Z32 Drum parking brake. You must trim off the dust shields and flip the drum assembly with cables left to right and upside-down. There will be tight clearance between drum anchor nut and LCA nut. *GTST skyline must delete HICAS / Use a S-chassis toe rod.