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 Colts: From 3-13 to 13-3

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The Colts appear again. They struggled in 1997 and ’98 going 3-13 in both years. In 1999, things turned. Peyton Manning found his groove and threw for more than 4,000 yards.

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