The first of two Camping World Truck Series practice sessions at Chicagoland Speedway was led by John Wes Townley.
Townley put down a top speed of 175.182 mph and was the only driver to top 175 mph in the 55-minute session.
Following Townley was William Byron, Matt Crafton, Timothy Peters and Cole Custer.
Matt Tifft, who will make his first NASCAR start since undergoing brain surgery for low-grade tumor on July 1, was sixth fastest at 173.332 mph.
MORE: Matt Tifft’s Long Summer
John Hunter Nemechek was 19th fastest at 171.876 mph.
The second Truck practice will run from 6:30 - 7:25 p.m. ET.
