speed manual, Spicer - 7 speed manual, Allison - 5 Speed / 6 speed automatic 8600 Caterpillar Cummins ISM / to / Note: References for this section are the same as for Variants References External links International Trucks Maxxforce Engines Caterpillar On-Highway Engines Cummins On-Highway Engines Commercial vehicles Navistar International trucks Trucks of the United States Vehicles introduced in 2002