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The Navistar MaxxForce 15 diesel is available with up to 550 horsepower and 1,850 pound-feet of torque. Peak torque is reached at 1,000 rpm and holds steady to 1,600 rpm, according to Navistar. This reduced gear shifts in uphill terrain and allows for shifting at lower speeds when accelerating. The MaxxForce 15 is available in vocational configurations.