 In the following season, 1947–48, Cox was an ever present as Rangers finished second to Hibs in the league, but won the Scottish Cup after a 1–0 replay win over Greenock Morton.Cox also netted his first goal during the season, scoring in a 2–1 win over Clyde at Ibrox.In season 1948–49, Rangers became the first club in Scottish football history to win the Treble and Cox played an important role, playing in 43 of the 44 matches.