I got 3 1/4 qts Out of the 833...
Only 2 1/2 qts back in before it started running out of the fill hole.
Should I Drive it around the block and then see if I can get more in there?
Service manual says it should take 4.
I would jack up the rear and run it for a minute and re-check. I wouldn't want to put a load on the trans knowing it's almost a quart down from where it was.