2.73 to 3.73 ?
That is a 2 series carrier, so you will have to buy gears for a 2 series carrier unless you are going to basically gut it and go with a 3 series. The installer will need a crush sleeve,(or solid sleeve),cover gasket, pinion seal, etc, shims maybe, or you can just buy the gears and get an install kit (such as Ratech). I would look at one of the sponsors sites that sell gears/kits and maybe call them up. Thunder Racing comes to mind, but there are several that carry or can get what you want.
Hope this helps. Never tore into a differential myself, just a nodding familiarity with the components.
i just did the exact same swap on my car which has a th350 transmission, and damn does it put a smile on my face when i punch it from a roll

