Gibron next returned to Chicago in 1965 to serve as the Bears' offensive line coach as part of a rebuilding project by team owner and head coach George Halas following a losing season in 1964 – only the seventh in franchise history. The Bears finished with a 9–5 record in 1965, but struggled in 1966 and 1967, Halas's final two seasons as the Bears' coach. Gibron was seen as a successful coach, and was courted in 1966 to be head coach of the Miami Dolphins of the American Football League but turned down the offer.