Through driver changes, network shuffles, a new championship format and NASCAR's push to reinvent itself, the one constant for more than two decades has been Jeff Gordon behind the wheel every week of the iconic No. 24.

It's time to buckle up for what's going to be Gordon's final ride. The four-time NASCAR champion will give up full-time driving at the end of 2015.

The title last year went to Kevin Harvick, who put together a brilliant first season with Stewart-Haas Racing. Harvick and crew chief Rodney Childers were the class of the field all year, and there hard work was rewarded with the championship that team co-owner Tony Stewart promised to deliver if they moved to SHR.