The auto is pretty beefy itself. The Getrag 5-speed swap is not exactly a weekend job. You'll need to weld in new mounting points for the tranny, plus deal with the clutch pedal and master cylinder and all that good stuff.
Get a good size fluid cooler for the auto, along with a B&M Shiftplus (unless you'll be using HPTuners) and some fresh synthetic fluid. If you want to go more into it, you can have it rebuilt with Raybestos Blue Plate clutches, and while it's open, pop in an LSD, or an insert. There's some other parts out there that are stronger internal parts than what comes stock, but I don't remember the sites for them offhand. I'll post them up if I find them again.
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