NASCAR issued a bulletin to Sprint Cup, Xfinity and Camping World Truck teams with changes to the rule book Wednesday.
Among the changes is a rule the requires a driver, crew chief and spotter to have radio communication, a new single rear-end differential assembly rule and a single transmission rule.
Previously, teams could change as many gears as they wanted but they had to be the right ratio. Now, a single rear end differential assembly rule will be enforced at all events except at Martinsville Speedway, road course events, the Daytona 500, the Sprint Showdown and the NASCAR Sprint All-Star race.
Martinsville and road courses are hard on gears. Because of the number of events leading up to the Daytona 500, teams can make a change. It’s also easy to break a gear in All-Star qualifying.
This rule should eliminate qualifying gears.
NASCAR stated that failure to comply with this rule could result in loss of practice time, loss of opportunity to qualify and confiscation of the rear end differential assembly, along with any other actions the series director deems necessary.
NASCAR formalized that a driver, crew chief and spotter must be able to communicate on the radio during an event.
NASCAR stated that effective Jan. 1, 2016 teams will be permitted only one transmission change after qualifying and before the race for events at Pocono Raceway and road course events.
Other changes included adding the new qualifying format for super speedways previously announced and other technical updates.