His second year in the League, 1941, was a banner year for McAfee: he led the league with a 7.3 rushing yards per carry while scoring a league-high 12 touchdowns in an 11-game season. While his rushing yardage totals seem modest by today's standards, he had to share the backfield with other outstanding running backs, such as Hugh Gallarneau, Norm Standlee, and Bill Osmanski, as well as Hall of Fame quarterback Sid Luckman. Known for his versatility, in 1941 his 12-touchdown total consisted of six by rushing, three receiving, one by punt return, one by kickoff return, and one by interception return, all while helping the Chicago Bears to their second straight NFL league championship over the New York Giants. That season, his 31.6 yards per punt return also set a franchise record that still stands.