Auto Transmission fluid question

I pulled the pan and replaced the filter and used Toyota T-IV fluid. Nothing unusual about doing it.

 

Sorry about the ressurection but im quickly approaching 100k and im going to start the drain and replace method. How much tranny fluid do i need to buy for each interval? 3or4 quarts?

 

Buy a case.
Your trans will need somewhere between 3 and 4, so a case will have you good for 3 drain/refill with maybe an extra quart or two.