In 2008, McClain was part of a "3-Headed Monster" that also included Ray Rice and Willis McGahee. McClain's role was larger that year. His best moment was probably when he ran for an 82-yard touchdown to seal a win against the Dallas Cowboys in Week 16, in the last game ever at Texas Stadium. McClain finished the year with 232 attempts, 902 rushing yards, and 11 total touchdowns as he was used more as a runningback.