The 18-year-old Smith from Johnston, Iowa, is set to campaign in his first full-time season in the Xfinity Series following a part-time schedule in 2022.
The reigning Xfinity Series champion from Charlotte, North Carolina, completes Joe Gibbs Racing's four-driver roster for the upcoming Cup Series season as he will pilot the No. 54 Toyota Camry TRD Pro.
The 20-year-old Gibbs from Charlotte, North Carolina, led a race-high 125 of 200-scheduled laps and persevered in a late battle against rivals Gragson and Allgaier to claim his first Xfinity title by winning the finale at Phoenix.
The 27-year-old Bell from Norman, Oklahoma and the 29-year-old Chastain from Alva, Florida, both captured Championship 4 spots following a dramatic finish in the Paper Clip venue.
The 27-year-old Bell from Norman, Oklahoma, capitalized on a late strategic call for fresh tires followed by two late-race restarts and a series of carnages to punch his ticket into the Round of 8.