10. 1984 San Francisco 49ers
The best team of the Bill Walsh and Joe Montana era lost just once all season - to the Pittsburgh Steelers - and finished first in the league in total offense, second in defense and first in point differential. The also crushed the Miami Dolphins and Dan Marino, 38-16, in Super Bowl XIX. Despite their record, though, this 49ers team didn't have the greatest receiver in NFL history yet. (AP File)