The Rock, Vin Diesel, and Paul Walker are all names you will see at the end of "Furious 7" ... problem is the people actually responsible for most of the adrenaline pumping action are irate because they were left out of the end credits. Sources directly connected with production tell us, the 2nd unit crew was responsible for all the major action ... including the parachuting car scene and the mountain road chase. We're told the stunt team members feel like they were "punched in the gut" when they realized 25 members of their team -- many of whom risked their lives -- were left out of the credits. And get this ... Paul Walker's 2nd unit stunt double -- who was inside a bus as it fell off a cliff -- was uncredited. We contacted Universal ... they told us they're looking into it.