We are on our second ring gear on our 04 Duramax. The first one wore thru in two locations (I assume the engine stops in these two points when shut down). We are now getting ring gear wear on the new one - less than 6 months old. The starter grinds for 2-4 times before engaging like before. Starter has also been replaced when the ring gears were changed. The gear on both starters look good, I think there may be a heat treat issue on the ring gear itself.

Any thoughts?

Thanks,
CTN