1/4 of a million miles with no fluid change... what.. ya want it ta last forever?

Sucks Dave, but, ya got 3 choices, 1.) have it rebuilt (about 12 hundred for an AOD) 2.) junkyard tranny, live dangerous, take chances, or 3.) bite the bullit, get a new one, some great deals to be had on '05 trucks Dave, and you need a monthly payment ta keep ya focused at work !
Good Luck with whatever ya do, you need a ride under your butt, pronto, tho.