Standard
Allison 2500HS 6-speed, double OD rated to 660 lb. ft. torque, w/Fuel Sense NAS
Optional
Allison 2500RDS 6-speed, double OD rated to 660 lb. ft. torque, w/Fuel Sense Premium
Optional
Allison 3000RDS 6-speed, double OD rated to 660 lb. ft. torque, w/Fuel Sense Premium