4-Speed Automatic w/OD
TorqShift Elect 5-Spd Auto w/OD w/o 99S-inc: electronic throttle control w/99S-inc: tow-haul and electronic throttle control
4-Speed Automatic w/OD (4R75E) -inc: auxiliary oil cooler
Transmission, 4 speed automatic with overdrive
Transmission, 6 speed automatic with overdrive -inc: tap shift up/down
Cooling, transmission oil cooler