At the start of the 2011 season, Hendrick Motorsports would shuffle the organization, and Earnhardt Jr, the No. 88 and his sponsors moved into the 24/48 shop, with Jeff Gordon's former crew Steve Letarte taking over as Earnhardt's crew chief. For 2012, PepsiCo decided to replace the struggling AMP Energy brand with the Diet Mountain Dew brand. The team won for the first time since 2008 and for the second consecutive year made the Chase, but Earnhardt suffered a concussion during an August Hollywood Casino 400 tire testing on the reconfigured Kansas Speedway, and was not tested for the concussion until the Good Sam Roadside Assistance 500 at Talladega, where he was involved in a second hard crash. After testing, Earnhardt was deemed medically unfit to race. Regan Smith, scheduled to drive for Phoenix Racing, instead drove the No. 88 at Charlotte and Kansas in what turned out to be a tryout that led to Smith joining Earnhardt's Xfinity team for 2013. Earnhardt returned at Martinsville and finished out the season.