bad 9 inch
You may be right on both counts. All 9 inch's run hot due to the sharp pinion tooth (pressure) angle. 2 hours towing a ski boat and I could smell gear oil with the windows up. I'm unfamiliar with napa parts here in Aus, but if it's a small bearing with thin oil and a tall tyre for leverage look out. How about a tapered roller, external seal & higher oil level? Works well in local hybrid ford centre, gm axle tube combo's.