2013-2018 Ram 2500 6.7L L6 Diesel. 2013-2018 Ram 3500 6.7L L6 Diesel. 2013-2018 Ram 4500 5500 6.7L L6 Diesel. The fan shroud basically houses the fan blades securing it in place and keeping it from damaging the other engine components that may disturb the smooth and even operation of the engine.
