Well... same question. But of interest to note: my new F250 with the 4R100 Tranny has a drain plug in the tranny pan.

Should make change less messy huh?
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2000 F-250 Super Duty, Super Cab XLT, Oxford white with grey cloth captains chairs, 5.4L Triton V8(260 HP version!), 4R100 4 Speed Automatic Transmission, 4 wheel ABS, Deluxe Aluminum Wheels, Trailer Towing Package, Class IV Hitch, Reece load distribution system, Escort Sensor II Electronic Brake control, K&N filter, "White-White" head lamps.