His last years saw increased playing time and success. He broke the record for most consecutive games with 100 or more yards by a Pac-10 runner, with 16 and set the Cougar single-season rushing record with 1,900 yards, which also led the NCAA Division I.
Harrison was selected by the Cleveland Browns in the fifth round of the 2006 NFL Draft. In his first season he made ten games including one start. He made his NFL debut against the New Orleans Saints, 10 September 2006. In his second season with the Browns, beating Harrison in eight games.
