Ralph Dale Earnhardt , Jr. ( born October 10 , 1974 ) is an American racecar driver . Earnhardt drives the # 88 AMP Energy\/National Guard Chevrolet Impala SS in the Nascar Sprint cup series for Hendrick Motorsports . Ralph Dale Earnhardt , Jr. ( born October 10 , 1974 ) , better known simply as Dale Earnhardt , Jr. , is a professional American race car driver and team owner who drives the No. 88 AMP Energy\/United States National Guard Chevrolet Impala in the NASCAR Sprint Cup Series for Hendrick Motorsports , and drives the Nos. 5 and 7 Unilever Chevrolet Impalas for his own team , JR Motorsports , in the Nationwide Series .