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 Morton. He also netted his first goal during the season, scoring in a 2–1 win over Clyde at Ibrox.
During the 1947–48 season, Cox was a key player for Rangers, who finished second to Hibs in the league but won the Scottish Cup after a replay victory over Morton. He also scored his first goal during this season, netting against Clyde at Ibrox.