BROTHERS 4-Link Kit is specifically designed for your 1973-87 truck. Many aftermarket kits use a 3 stroke shock resulting in a rough ride due to the higher spring rate needed. BROTHERS kit utilizes a 5 stoke shock with a 220 lb. spring for a smooth ride. For the ultimate in ride quality and adjustability, you can order the same great kit with air springs in place of the coil over shocks. This is not a street rod parallel 4-link kit retro-fitted to use on your truck. It uses a thicker, longer bar for an increased load capacity and smoother weight transfer. A 30 trackarm is included with the kit for less radial arc.