IndyCar said prerace aero setups from the June start will be mandatory for the completion of the race, though the series said it could make changes based on weather and other factors race weekend.
Teams will be able to use the chassis and engine of their choice for the completion day. Tire allotment and fuel quantity haven't been determined.
There will be only two races left in the IndyCar Series season after the Texas finish in August, which had been scheduled as an off weekend for the series.
The last IndyCar race postponed at Texas had been in 2001, when the series season finale was scheduled the weekend after the Sept. 11 terrorist attack. It was pushed back three weeks into October.
IndyCar officials believe that is also the last series race with an extended postponement. The last time an IndyCar race started and resumed another day was at Brazil in 2011, when the race was completed the next day.