This is the way I see it. Your rear is toast, and a ticking time bomb..

You could either buy new bearings(even, the outer axle bearing), get a rebuild kit fro a numerically lower ratio( 3.92 carrier of something), from Randy Ring nd Pinion, richmond gear, or who ever, adn have some one set it up for you...

OR, you could go to a bone yard, adn find another rear end,same ratio, adn even find the G80(LSD), taek it home, un bolt the old one, bolt the new one in, bleed your brakes, adn your driving...

I see the second option being the cheapest, adn you will probaly spend more time locating teh rear axle, than you will replacing it...

My 2 cents.....

Chase

Let us know your location, some of us know where there are good axle..well, I can find them.....