the od light keeps flashing but just had rebuild put in what should i do
it is a f150 xlt 2 wheel drive tranny is 4r70w

 

Take it back to whom ever put it in before you cook it. Something is seriously wrong for that light to blink. Probably a pinched wire.
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Same thing happens to my Mustang with 4R70W from time to time. After turning the car off, it resets and I don't see it again for a long while. What's the code that is stored? Mine was for 2-3 shift solenoid not being happy. If you just had the trans rebuilt, it may take some driving to get the ECU/TCM to "learn" it and for it to wear in a little.

 

This ^^^^