The AX4N transmission also known as the 4F50N is a 4-speed electronically controlled automatic transmission produced by Ford for 1994-2007 vehicle models. The AX4N transmission design is an improvement upon its AXOD and AX4S predecessors. The AX4N transmission proved itself to be more reliable than the AXOD with improved shift quality. See available Raybestos Powertrain AX4N transmission parts below.