The factory leaf spring shackles on your big diesel truck do their job, but they can suffer from vibration and handling issues, especially if your truck has more than a few miles on it. Sulastic's replacement shackles use a unique rubber spring design that reduces vibrations and deflection to improve your truck's ride quality and handling all in one place. Sulastic has Duramax shackles, Cummins shackles, and Powerstroke shackles available, all of which maintain near-OEM ride heights while improving your truck's rideand handling in a big way.