there's and upper and a lower plug. The lower is for draining and the upper is for filling it back up. Much like the diff's you fill it in the top plug until fluid comes out.
Did you pull the lower or the upper plug?
You can find further explanation here: POWERSTROKEHELP.COM - The Information Source for Ford Power Stroke Diesel Owners
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7.3L Stroken 4 life!!! 
2002 F-250 4x4 7.3L Powerstroke 205K(7/2011)
AIS Intake system, BFG KM 2 Mud Terrains  new @ 184680mi (1/28/10), Cab Clearance Lights self install 4/17/10, Foil delete and new IC boots 4/24/10
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