ZF North America (ZF) is recalling certain RL 77, and RL 80 EM axle assemblies, part numbers 4474077034, 4474077019, 447407718, 4474077021, 4474077020, 4474077036, 4474077026, and 44740770 manufactured May 1, 2014, to May 29, 2015. Certain ZF RL77 / 80EM independent front steering axles equipped with Bosch 8018 steering boxes. The boxes were manufactured using incorrect internal spacers that can cause premature wear in the connection between the steering wheel and the front axle.