Henry Josey broke loose for the go-ahead score on a 57-yard run with 3:34 to go and No. 5 Missouri wrapped up the SEC East, riding a strong second half to a 28-21 victory over No. 19 Texas A&M on Saturday night.
Missouri (11-1, 7-1 SEC) advances to the conference championship game against Auburn - a matchup of schools very lightly regarded before the season.
Missouri has made a six-win improvement from its initial SEC season and fourth-ranked Auburn (11-1, 7-1) has topped last year's total by eight after stunning No. 1 Alabama.
Texas A&M's Johnny Manziel was held in check for the second straight week, throwing one touchdown pass and rushing for 21 yards on 11 carries.
He was 24 for 35 for 195 yards.
Thousands of fans among a sellout crowd of 62,197 - nearly all of them clad in black, stormed the field after the game ended.