The following season, Sprague won at Phoenix, Nazareth, and Nashville Speedway USA, and won the championship. In addition, he returned to the Cup series, subbing for Ricky Craven at Bristol Motor Speedway, but finished 40th after a wreck. Despite winning the Truck Series championship, Quaker State did not return as Sprague's primary sponsor, forcing him to start the 1998 unsponsored. After a one-race deal with Big Daddy's BBQ Sauce at Portland Speedway, Sprague won The No Fear Challenge in his debut for sponsor GMAC, allowing them to join full-time as sponsor. He won five races total that season and finished second in points. He returned to the Busch Series to drive the No. 40 Channellock-sponsored Chevy for Doug Taylor at Watkins Glen International, finishing sixth.