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On Wednesday NASCAR announced new rule changes to the NASCAR Sprint Cup, Xfinity and Camping World Truck series, effective immediately.
According to NBC Sports, NASCAR issued a bulletin to teams regarding several different things. Among the changes are that NASCAR requires drivers, crew chiefs and spotters to have radio communication on the same frequency. Also listed were a new single rear-end differential rule and a single transmission rule.
NASCAR used to allow teams to change as many transmission as they would like but had to have the right ratio. That is no longer the case. The new single rear-end differential rule will now be in effect for all races aside from races at Martinsville, the two road-course events, The Sprint Showdown, The NASCAR Sprint All-Star Race and the Daytona 500. Martinsville and the road-course events are hard on gears, as is qualifying for the NASCAR Sprint All-Star Race. The length of Daytona 500 weekend is the reason for the exemption during that weekend.
NASCAR also determined teams must to be able to communicate to each other on the radio on the event and effective January 2016, teams will only be permitted one transmission change at the races at Pocono Raceway and the road-course events.
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