Matt Crafton paced the first of two Camping World Truck Series practices Friday at Michigan International Speedway with a lap of 187.744 mph.
He was followed by Chase Briscoe (187.125 mph), Grant Enfinger (187.062), Ryan Truex (186.095) and Kyle Busch (185.955).
Stewart Friesen scraped the wall with the right side of his truck.
Darrell Wallace Jr., in his first event since filling in for an injured Aric Almirola last month in Cup, had the best average for 10 consecutive laps at 183.917 mph.