Munchak was an offensive lineman for Penn State from 1978-1981 during this time he was a starter for the 1979 and 1981 seasons; However, he missed the 1980 season due to knee injury. During his senior year, he was named a second team All-American and was subsequently drafted 8th overall by the Houston Oilers.
During the 1982 NFL Draft, Munchak was chosen as the Houston Oilers' first round draft pick (8th overall), making him the first offensive lineman drafted that year. In his rookie season, he quickly earned a starting position at the left guard position. He remained in that position for 12 seasons. During that time he garnered nine Pro-Bowl nominations, four All-Pro, Nine Second Team All-Pro, seven All-AFC, and four second team All-Pro selections. In addition he was selected for the 1980s All-Decade Team. Munchak's 12-year tenure tied for second most seasons played with the Houston Oilers.
Only one year after his retirement, Munchak joined the Houston Oilers staff in 1994 as an offensive assistant/quality control. In 1997, three seasons later, he was named offensive line coach, where he would remain for fourteen seasons. Following former head coach Jeff Fisher's departure, on February 7, 2011, Munchak was named head coach of the Titans. 2011 marked his 30th season with the organization.