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?

2016 Cowboys: From 4-12 to 13-3

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The Jason Garrett time in Dallas saw ups and downs and downs and ups. One of the highs was going from an awful 4-12 in 2015 to a 13-3 season that ended with  that Divisional round loss to Green Bay.

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