the company went from borg warner, then to btr, then ion and now have been bought by a japanese company(they are 2km up the road from me).
all the gearboxes and diffs are designed by ford and are told wat parts to use (i know alot of ppl there). they dont design a thing these days unfortunately.
ive seen a cop xr8 that was sent back to the dealership here after 20,000kms with a blown engine aswell. knowing that they do give it a flogging but any standard car should b able to take wats limited to them (rev limiter). anything past that would b death regardless.
also my pops vy ss ute had a diff problem aswell. it shat itself n he had to wait 4 months for a new one as they had that many others waiting for diffs aswell.