Parallel 4-Link Rear Suspension Kit

The Speedway Motors 91649068 is a universal drag race heavy-duty parallel 4-link rear suspension kit engineered to provide superior control and adjustability for high horsepower applications. It is compatible with both full frame and unibody vehicles, offering a significant upgrade over factory setups prone to wheel hop or component damage under high torque loads. The parallel 4-link design utilizes four links (two upper, two lower) that are parallel to each other, connecting the axle housing to the vehicle's frame or unibody. This system effectively locates the rear axle, centers it, and prevents unwanted pinion angle changes during acceleration. The kit includes robust 7-gauge steel frame brackets and axle brackets with a 3-inch radius to accommodate common axle tubes, ensuring strength through double shear mounting. The 1-inch steel link bars are equipped with heavy-duty 3/4-inch rod ends for easy on-vehicle adjustments of pinion angle and axle centering, with numerous mounting holes for fine-tuning suspension geometry. While this kit controls axle fore/aft location and pinion angle, it requires an additional Panhard bar or Watts link for lateral axle control. Installation involves welding the frame brackets to a structural part of the frame or unibody; some vehicles may need additional reinforcement or a crossmember. For street use, sealing washers for rod ends are recommended to prolong their life. Anti-seize lubricant is advised for all threaded connections. This conversion kit provides the adjustability needed to tune rear suspension capabilities for varying track conditions, tire temperatures, and horsepower levels, ensuring a straight launch and optimal performance on the dragstrip.