Yep, that point can't be stressed enough. Emptying your tranny or diff without being able to refill it would be a doozy.
One other important safety practice is to complete one task at a time. For example, I had the car up on a lift to do the tranny oil change. I changed the engine oil at the same time. While it would have been faster to empty both, refill the tranny and then drop the car to refill the engine oil, that is a risky practice. It's easy to forget you haven't refilled the engine oil, fire up the car and....oops.
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