well, i've helped replace a blown diff on a MY99. there were 3 of us, which was good. we also had air tools, which was also good. i wasn't there to remove it, but it took the two guys about 4 hours. putting the new one in took us about 3. all in all, its not too challenging, there's just alot of stuff to do, like unhooking the driveshaft and the entire rear suspension. also, i don't know what year you have, but the rear axles on the non-LSD equipped cars are longer then on the MY00-01 cars. i don't know which one Quaiffe uses.