It's the 5R55E, the same as the 97-01 Explorer model you know of. The next gen five speed went into the 3rd gen Explorers, but not the tail end 2nd gen trucks(01-03 Sport, 01-05 Sport Trac). I don't know if the Ranger(98-2011) stayed with the 5R55E for that whole run, but I bet it did. Those Rangers are a great source of font suspension parts, the diff, gears, and some interior stuff, plus the 4.0 SOHC engine and trans.