DiBenedetto, who learned this week he will be out at Leavine Family Racing at the conclusion of the 2019 season, led the way in final practice at 128.848mph.
Ryan Blaney was second on the speed charts but the session did not end the way he would have wanted. While lapping, he suffered a power steering failure and dropped fluid around the track.
“Just blew the power steering pump, blew the guts out of it,” he told NBCSN. “Happened right in the middle of (Turns) 3 and 4 when you’re fully turned left … it was an instant kind of snap. Not sure what it did to my shoulder but I just needed a second.
“That stinks but at least we didn’t hit the wall or nothing.”
Blaney also topped the five lap, ten lap and 15 consecutive lap averages.
NASCAR decided to add an extra 12 minutes to the session following the track cleanup.