In 2005, Grimm added another Super Bowl ring (totaling 4) to his résumé as part of the Pittsburgh Steelers' coaching staff (offensive line coach). Under Grimm's guidance in 2005, the Super Bowl champion Steelers averaged nearly 140 yards rushing per game during the regular season to rank fifth in the NFL while also grinding out 181 rushing yards in their Super Bowl XL victory over the Seattle Seahawks. In 2006 the Steelers' offensive line helped pave the way for running back Willie Parker to gain 1,494 yards and 13 touchdowns on 337 carries with 4.4 yard avg. and earn his first Pro Bowl selection. Pittsburgh offense finished the 2006 season with the 10th-best rushing attack in the NFL, helping to give the Steelers the 7th ranked total offense in the league. Parker finished the season with the second and third top rushing performances of the year in the NFL with 223 rushing yards 32 att., TD against Cleveland Browns and 213 yards with 22 att, 2 TD vs. New Orleans Saints.