You can use a spare slip yoke to plug up the tail shaft. Have it ready and stick it in there a split second after you remove the driveshaft. If you do that, and use some appropriately sized vacuum caps on the lines and fittings, you will lose hardly any fluid if you can't drain it beforehand. Bend a piece of sheet metal or aluminum about an inch wide, drill a hole in it to run a bolt thru to hold your converter in while you're removing the 727. You can use a box end wrench bolted to the trans to do the same thing. Watch your dipstick tube and don't hang it up on something on the way down with the jack. When you get it sitting down, zip tie the tube bracket thru the bolt hole to keep it in place until you get the trans out from under the car. Your plan with the floor jack and small piece of plywood works fine....I've done it a thousand times! Depending on how high the bottom of the car is off the floor, you may have to drop the trans off the jack and drag it out by the tail shaft housing if it won't clear the rocker panel while on the jack. Wrestling it back onto the jack going the other way is the hard part....lol. Good luck to you.
:thumbsup: