Expanding its family of heavy-duty single and tandem drive axles, the 590 drive-axle series features helical-reduction gearing technology to enhance startup performance and durability on severe grades. The drive axles provide drive-train ratings to 2,450 lb.-ft. of torque, 700 horsepower, and gross combination weight ratings in excess of 260,000 pounds. Ratio coverage ranges from a fast 4.75:1 to the deepest 10.90:1 to meet a range of applications. Both front and rear axles can be specified with driver-controlled wheel differential locks for maximum traction.