340 lbs Rate For Big Block Engines With Standard Suspension & Small Block Engines With Hi-Performance Suspension Composite monospring restores lost ride height, eliminates leaf spring squeaking, and provides a smooth, comfortable ride without sacrificing performance, and best of all - it never wears out. Weighing only 8 lbs., the monospring reduces unwanted, unsprung weight while improving handling performance at the same time. The spring is supplied with complete, step-by-step instructions, differential mounting kit, heat shield and 7 ¼" adjustable long spring bolts with new rubber cushions. Note: If you have changed to a GM replacement rear end cover, you must use either an 25-122870-1, 25-122866-1, or 25-122867-1. If you have installed a heavy duty25-122884-1 rear end cover, you must use either an 25-122862-1, 25-122863-1, or 25-122865-1.
