The factory control arms on your 2017-2019 GM 6.6L Duramax L5P can become a weak point, especially after adding a lift or leveling kit, or if you regularly push your Sierra or Silverado 2500HD/3500HD to its limits. Upgrading to stronger aftermarket control arms is a great way to increase suspension travel and improve durability, making them ideal for lifted trucks or heavy-duty use and abuse. These upgraded arms are specifically built to handle the demands of heavy-duty off-roading, towing, and hauling, ensuring your truck can handle whatever you throw its way. Pair them with a new Steering Stabilizer or some new Shocks to even more control when you're behind the wheel.GM Duramax Fitments: 2017, 2018, 2019 GM 6.6L Duramax.Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali.Some exceptions apply, please see individual product pages for specific fitments.