Transmission, 4-speed automatic -inc: electronically controlled w/overdrive, tow/haul mode & internal transmission oil cooler
Brake/transmission shift interlock, for automatic transmission
Transmission, 6-speed automatic, heavy-duty -inc: electronically controlled w/overdrive, tow/haul mode & internal transmission oil cooler
Transmission oil cooler, external
6-Speed Automatic -inc: lock up torque converter and transmission cooler