On March 28, 2019, Biffle announced he would be testing with Kyle Busch Motorsports the next day at Texas Motor Speedway in the No. 51 truck. He was eventually tabbed to drive the truck for the SpeedyCash.com 400 at Texas.[4] Biffle started sixth and won in his series return, leading 18 laps and holding off Matt Crafton while winning $50,000 in a promotion with Gander Outdoors; it was his first Truck victory since 2001.[5]