Ok two questions probably easy but wouldn't mind some words from the experienced. I just changed the filter on my 67 skylark. St300 switch-pitch, buttoned up with a new cork gasket, added 3 pints per the manual, and no oil showed on the dip stick running in neutral. Added more fluid at pint at a time checking each time. Heard air being expelled through the tube when I shut it off. I'm up to about 2-1/2 quarts now, but still not at the manuals spec of 1/4 below full on the stick running in park. Transmission slips, and engagement isn't immediate as it used to be. Should I just keep filling till I see it on the stick? I assume the slipping is due to low fill but I don't want to over fill. Part two. I started this project last weekend and didn't get back to it until today. Car sat nose high in the garage for a week dripping out fluid. I am quite sure I drained out way more than I have put back, probably close to 5 or 6 quarts. Hard to tell since quite a bit flowed out all over the floor when the pan came down... could they not have put in a drain plug? Anyway, is it possible I just drained way more than would be expected on a typical trans service? Or is there some other process I need to do to get this gliding through the gears (both of them) like it used to be before I did the preventative maintenance to keep it that way?