Drive it.
Your tranny will be in 3rd gear the whole way, and your gas mileage will suffer for it.
Keep the speed down to 55-60mph so you dont do any damage to the clutch packs, via overheating.

Then again your going to rebuild it.
Buy a rebuild kit (paper and seals)
Get a "High Performance rebuild kit", kevlar clutch pack materials.
Kevlar 2/4 band
Beast Sunshell
New torque converter.
Tranny Kooler Clean, use it to blow out the tranny cooler and tranny cooler lines.
New tranny fluid.
Vaseline
And both of those manuals.

Google "Raptor 4L60E"
The first site that comes up will list every part available for the tranny, and tons of modification options. This tranny is strong and dependable, it can be built to handle 450 foot pounds of torque, and can be build from mild to wild. You could even install a manual shift valve body, and row through the gears by hand, up and down like a muanual tranny. GM put the 4L60E into ALL 1/2ton trucks, vans, SUV's and rear wheel drive cars like the Corevette.
You should be able to find a suitable donor at your local salvage yard, just add a can of Lucas Trannyfluid chemicals when you drop it in.