Like all Allison transmissions, the Allison 3414 Regional Haul Series™ works with any fuel source. Its patented torque converter boosts engine torque, compensating for the lower power often associated with compressed natural gas. (Photo: Business Wire)Like all Allison transmissions, the Allison 3414 Regional Haul Series™ works with any fuel source. Its patented torque converter boosts engine torque, compensating for the lower power often associated with compressed natural gas. (Photo: Business Wire)INDIANAP ...