From 1962 to 1965 he was a part-time starter, making 9 starts in 1963.
Gabriel played every game from 1966-72, starting all of them except for 2 games in 1972. He made the Pro Bowl every season from 1967-69, and in 1969 was named first-team All-Pro. as well as the league's MVP.
He was traded to the Eagles after the 1972 season for wide receiver Harold Jackson. Gabe played for the Eagles for 5 seasons, starting every game in 1973 and adding another Pro Bowl appearance, while leading the NFL with 3219 passing yards and 32 touchdown passes.
Gabriel played in 11 games in each of '74 and '75, starting most of them.
In 1976 he lost the starting job to Mike Boryla, but played in 4 games (all starts).
He backed up the newly-acquired Ron Jaworski in 1977, his final season.
