49ers building one of biggest single-season turnarounds in NFL history

The current San Francisco 49ers team has done an amazing turnaround. Where do they rank when it comes to NFL history?

1999 Rams: From 4-12 to 13-3

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The Rams and Dick Vermeil struggled big time in 1998. Tony Banks was 4-10 in his starts. A backup named Kurt Warner completed 4-of-11 passes in his one appearance. The next season, Warner started every game, throwing for 4,300 yards and 41 TDs. The team went on to win the Super Bowl over the Tennessee Titans.