Description Replacing the serpentine belt is a highly recommended preventative maintenance job that will keep your truck from being on the side of the road with a broken belt! These standard duty belts are the same belts your truck came with from the factory. The HD belts are a stringer than original duty belt with longer life span. Standard duty Gates belts are made offshore. K080635HD K080638 ***NOTE: there was multiple different belts used on these trucks based on intercooled, non IC, AC, non AC, etc. Double check to make sure you are ordering the correct belt!***