If you regear that it will cost you more than pulling one yourself with the correct gears and LSD. if it has 4:10 you are good. If it is you plan on locking it and it is an open diff you are ok. Otherwise, get one with limited slip and disk brakes. You can usually pull them for $200 or little more.
You need gears that match your front which are 4:10 if stock in a 2.5. Regearing is different, then you would go to 4:88 or something like that. Just google it and why to do it for more info. Lots of threads on it. .
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