Derek pretty much covered everything, as you knew I was out of town this weekend and not much to say after we spoke on the phone.
But I'll add a couple points....
We discussed rear ends HEAVILY, and it was my understanding you knew and were planning on making it one of your first upgrades/changes to the car. We both agreed how WEAK the factory rear ends for the car, let alone that it's 26 years old, has 130k on it, and has probably TRIPLE the torque going to it than it was built for.
You had been out a few times to inspect/discuss the car and knew the history of it. You knew I had taken it to the track, parked it in the garage, and forgot about it due to not working. Nothing leaked in the entire THREE months it was parked, and the quick 5 minute drive I took it on last week went just fine.
That break in the axle appears fresh, and obviously wasn't there when you left or there wouldn't be fluid still leaking after 20 miles of driving.
The car has plenty of power for what it is and driving on SLICKS having just bought the car, who WOULDN'T play around with their new toy? I sure as hell would, and fully expected you to, but I CAN'T be blamed for problems caused by that.
I agree it SUCKS hardcore how it happened, but shit happens and there's only so much anyone can control.
I told you a few places to check for rear ends and sure if you buy one from a junkyard you'll probably pay a premium over a forum, but like I said, I wouldn't go that route and from what I understand you weren't planning on that either.
If you don't want the car anymore I know someone who may buy it, they just didn't have as much as I needed for it so they didn't buy it.