I have a 2005 2500HD. This was the tricky part to find and it took a lot of research to make sure I got the right one. Even the local parts stores didn't have the right part. This stopped the leak at the axle. Easy to change. Just make sure you remove all of the old gasket from the axle. Sometimes the middle of the old seal sticks to the truck. Mine wasn't difficult to remove, but the old gasket fell apart and some of it was left on the truck.
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