That's curious...
Luckily my public library gives me access to Chilton's online...
Code:
1997:
E—automatic, E4OD
U—automatic, 4-speed, 4R70W
1998, 1999:
U—Four-speed automatic (AODE-W/4R70W)
E—Automatic (4R100)
2000:
E—Four-speed automatic with overdrive (4R100) with 4.2L and 4.6L engines
U—Four-speed automatic with overdrive (4R70W)
9—Four-speed automatic with overdrive (4R100), diesel engine
2001, 2002, 2003:
9—Four-speed automatic (4R100), diesel only
E—Four-speed automatic overdrive (E4OD/4R100), gas only
U—Four-speed automatic overdrive (AODE/4R70W)
2004:
5—Four-speed automatic overdrive (4R75W)
B—Five-speed automatic overdrive (5R110/Hi-Torque), diesel
E—Four-speed automatic overdrive (4R100)
U—Four-speed automatic overdrive (4R70W)
2005:
A—Four-speed automatic overdrive (4R70E)
B—Four-speed automatic, TorqShift, (4R75E), diesel
F—Four-speed automatic overdrive (4R75E)
T—Five-speed automatic overdrive (5R110W)
Looks like you have the 4R100. Diesel, right?
-- Geoff