As a junior, he started seven games at right tackle and won the Meyer Morton Award for the 1964 Michigan Wolverines football team that compiled a 9–1 record, outscored opponents 235–83, and defeated Oregon State in the 1965 Rose Bowl. As a senior, he started seven games at right tackle for the 1965 Michigan team, and he was selected by the Associated Press as a first-team tackle on the 1965 All-Big Ten Conference football team. Mack was inducted into the University of Michigan Athletic Hall of Honor in 2006.