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Ok I decided to service the trans myself(4r100 deep pan) I read everything that I could find including videos at powerstroke help.com. Not sure on the oil that autozone reccomended (max life dex/merc) everyone says it will take 10 quarts including the converter. where am I going wrong. I've already used 12 quarts and still don't look full to me.
If the fluid you bought says something like, "For use in vehicles that formerly used DexronIII/Mercon" you're good-to-go. I believe Penzoil says this on their jugs.
If you have Mercon V, they re-formulated it to be usuable in 4R100's, so you're still good!
It is very confusing since they say now that you can use safely certain brands. Mercon V is my choice although I used the Napa mercon V compatable fluid. It would also help to take the time to fill out your signature so we know what year your truck is and so on. 8 quarts is the norm for a trans pan change out, not sure on the converter ammount, somebody will be by.