Briscoe, driving the No. 27 Ford F-150 for ThorSport Racing in a one-off effort, shot to the top of the leaderboard in the first session with a lap of 93.473 mph for the defending race winner.
Closing out the top five were series regulars and alliance teammates Stewart Friesen at 92.398 mph and Sheldon Creed at 92.237 mph.
Rounding out the top 10 were ThorSport’s Johnny Sauter, Young’s Motorsports’ Tyler Dippel, Kyle Busch Motorsports’ Todd Gilliland, ThorSport’s Ben Rhodes and Kyle Strickler, who is piloting the No. 54 Toyota Tundra for DGR-Crosley.
Mark Smith, driving the No. 38 for Niece Motorsports, brought out a caution twice, and Briscoe, KBM’s Harrison Burton and Young’s Motorsports’ Gus Dean all brought out the yellow flag in separate incidents.
ThorSport’s Grant Enfinger, the current points leader, turned the most laps in this session at 87, while Darwin Peters Jr took the fewest laps with just one. Peters’ No. 74 Chevy was the slowest vehicle on track at 46.012 mph.
30 of 32 trucks entered participated in this session.
Friesen took the top spot of the leaderboard in the second session with a lap of 90.516 mph.
Briscoe was right behind in second at 90.303 mph, while Moffitt was third at 90.090 mph.
Rounding out the top five were Gilliland (90.027 mph) and Crafton (89.901 mph).
The rest of the top 10 were Enfinger, Sauter, Rhodes, Strickler and Creed.
Creed and Sauter both spun, bringing out yellows.
30 trucks participated in this session, though Jennifer Jo Cobb didn’t complete a lap.
The qualifying races for the 2019 Eldora Dirt Derby will begin around 7 p.m. ET on Thursday, Aug. 1, on FS1, with the main feature beginning around 9 p.m. ET.