Massive Hole in Diff Cover!
As I did that, I heard a clunk coming from the rear of the car. I kept pulling up to the gas station, and then heard what I thought was a flat tire, a kind of rubbing sound. I stopped and hopped out thinking I was going to put the spare on.
But as I came around to the rear of the car, I saw rear-end fluid pouring out of the diff cover. I looked under and saw a long rip in the cover. It looks like the reluctor wheel hit the inside of the cover and cut it.
I have noticed a kind of clunking from the rear from time to time, so it's no surprise. I guess the 60mph tire smoking burn outs finally took their toll on the 10 bolt! I'll bet the main caps came loose and the carrier is moving around in there.
I haven't checked yet, but is the cover steel or aluminum? I think I can weld it up so I can get it back in the road until I get a 12 bolt. Can I run without the reluctor wheel? I might just check to see if I can tighten the mains and salvage the rear for a while.

