Personally, I'd rather blow a half shaft than a rear end or trans. But you can find threads with broken trans, rear gears, axles, half shafts, all that, nothing is entirely safe.
T5's can and do break. TKO is much stronger. Top loader is stronger yet. There are many other choices even stronger. The question really is: What is "strong enough" for your style of driving without breaking the bank?
Breaking a rear differential is fairly rare, other components usually go first. Drive shaft, half shaft, axle, clutch, trans (motor
).
But I do recall a thread about a BDR breaking the rear end ring gear! I guess I'll get called for bashing BDR's because I mentioned that. Do a search if you doubt it, I could post a link to the thread/post, but won't bother. Believe it,,, or not.
Fordracing65, playing with fire, it's not IF, it's WHEN something breaks on that IRS. That's pretty cool though, FAST car, go get 'em!