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The Steelers best season, as far as their record, was 2004, they went 15-1 and lost the championship game. The Steelers best seasons were when they won the Super Bowl. The 1974, 1975, 1978, 1979, 2005 and 2008 seasons.
The 1972 Miami Dolphins are the only team to go through a season undefeated. Their regular season record was 14-0 and they won their two conference playoff games and the Super Bowl to wind up 17-0.
The St. Louis Cardinals had the best regular season record in 2005, going 100-62. http://mlb.mlb.com/mlb/standings/index.jsp?ymd=20051002 (full standings for 2005)
The 2007 Patriots went undefeated for the entire season until they lost the Super Bowl to the Giants. Unless you meant to ask what team has the best win-loss record in the history of the franchise, but has never won a Super Bowl, that would be your answer.
San Francisco 49ers