In those first four years, McIntyre won a Super Bowl and in 1988, he was anointed as San Francisco's starting Right Guard. The 49ers won the Super Bowl that year, and McIntyre was moved to the left side at Guard, where he would stay for the next five years. McIntyre won another Super Bowl in those five years, and he was a perennial Pro Bowl Selection. He never had a year where his Approximate Value was lower than 11, and in 1992, he was a Second Team All-Pro.
McIntyre left San Francisco for the Green Bay Packers in 1994, thus ending his San Francisco run.