Trammell, along with his Tiger teammates, enjoyed a championship-winning season in 1984, when they started the season 35–5 and led the American League wire-to-wire en route to winning the World Series. Despite a season-long battle with tendinitis in his shoulder which caused him to miss 23 regular season games, he finished fifth in the AL batting race with a .314 mark and ranked eighth in on-base percentage (.382). In the 1984 American League Championship Series against the Kansas City Royals, Trammell hit .364 with one home run and three RBI. Finally, in the World Series, he hit .450 (9-for-20) against the San Diego Padres, including a pair of two-run home runs that accounted for all of the Tigers' scoring in a Game 4 victory. Detroit won the series 4–1 and Trammell was named World Series MVP.