im tired of my car only spinning one tire on burnouts and was wondering wut was a good locking or posi gears to put in the stock axle or would it be better to go to a buy a beefy axle off of a different car that would already have a posi or locking diff

 

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It's usually cheaper to buy a whole posi/disc rearend out of another third or fourth gen f-body, but if it's in your budget, a brand new Eaton posi unit would be the best way to go. They're far more durable than the factory Eaton gov-lock or Auburn posis, plus they're fully rebuildable unlike the Auburns.