Dear j.pelchat,
Hope you're well. I'd use a low-price plastic tarpaulin to protect the driveway. Before pulling the tranny, though, I'd flush it with cheap automatic transmission fluid (ATF) (Wal-Mart or local equivalent). As the car is driveable, I'd drive it for 1000 miles / 1,500 kilometers. I'd reflush with Mobil 1 Synthetic ATF or equivalent. I'd drain and remove the steel ATF pipes, cap the pipe openings, remove the tranny and store it. Before disconnecting the ATF pipes from the tranny, put rags under the pipe connections, to catch fluid drips.
Storing the tranny "dry", i.e., without fluid in it, is likely to cause seals to dry-out. Further, by allowing air into places where air should not be, "dry storage" risks corrosion.
Further, when a "stored-dry" tranny is re-activated and filled with ATF, the pump will have to run "dry" for a few seconds. As the shifter is moved, it will take a couple of minutes for ATF to displace air and coat all internal working surfaces. This brief "dry" running cannot be good, as ATF is both a coolant and a lubricant.
The work involved in pulling a tranny is such that nothing should be done that might shorten the service life of the unit.
Hope this helps.
Yours faithfully,
Spook
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