I feel your pain. Was looking at an $11.2k replacement cost for my rear diff earlier this year. Finessed the situation by finding one in a scrap yard.
$900 tax in, including labour is what I wound up paying.
Staring down the barrel of a $10k plus repair is the worst feeling in the world.
Well there's no sick fadez left to be copped now that the regimen cannot be admired in all its glory
RIP sick fadez.