Q: Transmission not shifting on 2008 Toyota Tundra

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I mistakenly drained transmission fluid, thinkin it was oil. Drove around for about an hour, finally took it to shop. Shop changed oil, and trans fluid, checked out ok. One day later, warning lights and won't shift into higher gears or reverse. What kind of cost am I looking at? Any way I could get warranty to cover boneheaded mistake?
(2) Answers
I agree with Roy's answer, I just think it'll cost more than he does. I'd say the clutches could be burnt and the bearings and shims could show evidence of lack of lubrication.
The warning lights indicate that the computer has detected a malfunction in the engine/transmission control system and has diagnostic codes and data stored which would be essential in diagnosing the problem.
A technician with a scanner can access the diagnostic codes and data and then be able to give you a diagnosis.
You could take it to the dealer and lie by omission and not tell them what you did. It's very possible that they'll fix it. It depends on mileage and what they determine happened to the transmission, and their policies at the dealer and maybe at the regional rep level.
You'd probably have to pay for an hour's labor time for diagnosis which should be refunded to you if warrantee pays for it. You could also take it to a transmission shop or a Toyota specialist and get it diagnosed. I wouldn't mention trying to get under the warrantee radar if I were you.
not knowing what's wrong with your transmission, I can't guess what it'll cost to fix it. An overhaul could run between $2000 and $3000 depending on what's damaged and the local labor rates. I'd assume that the dealer would want to install a factory rebuilt transmission if there's any internal damage at all for reliability and warrantee purposes rather than "teardown and repair as needed."
If you want to find a Toyota specialist, here's our directory link for you:
probably burned out the clutches.
you are looking at an overhaul with a converter. i would guess at 1800-2200 depending on damage done.
the dealer may say yes till they remove it and find the burned clutches and then call you and say no due to driver abuse.