727 reverse failing.

I carefully filled to the line on the dipstick when engine was warmed up but not running. I now know it should have being running whist it was being checked/filled.But that's how it was done. As the engine WAS running I put it through the gears with the handbrake on at standstill.
I checked the level again today without starting the vehicle and it's still 3" above top filling mark.
you didn’t answer my question. how many qts have you put in? And what are the circumstances?