I recently blew my rearend in my 99 GT. I was going to replace it with an Eaton differential, but the units were backordered for at least a month to a month and a half. I went to Reider Racing in Taylor, MI. The reason they are backordered is because the casings are made overseas. The units are made in Grand Rapids, MI. It's obvious everything is moven overseas, but I dont know about you guys, I went with the Auburn Pro, I don't really want a diff. casing that is made in Japan for a quarter an hour!