Why replace your diff cover with a Motobilt HD Diff cover? We do get asked this question on occasion. The factory diff covers are too thin for abuse on the trail. One of the common factory diff cover failures occurs when the edge gets peeled up from a rock sliding across the diff. For a bit more on why you'd want to change out your diff cover, check out the video by Trails Offroad where Josh installs and reviews our Motobilt diff covers.