[acammer]

For what it's worth - the life of a stock axle (or the diff) is very dependent on what you do to it, far more than the power you feed it. The driveline in these cars is not very tolerant of shock loads, and that's what tends to tear stuff up. I've had a few ring gears that couldn't handle the drag strip use I gave them - but I've never had a stock axle fail. If you want to bulletproof, axles aren't a bad step, but as long as there is an SS differential back there you still have a weak link - and if you shock it enough times it will fail you.