I'm no rear end specialist but I do know the rears we put together at work do not whine when done. We generally consider that a problem. On the other hand when I was getting ready to buy the ring & pinion set for my car more than one person I work with said that they'd had problems with noisy richmond sets. I ended up getting a set of precision 3.70 gears from Randy's Ring & Pinion online. Not only do they not make a sound but the only break-in I did was to just get in and drive. Truly sorry about your loss though, money doesn't grow on trees to fix these things.
BUILT FORD TOUGH