In a small mixing bowl, combine 5 oz. evaporated milk and pudding mix. Beat on medium speed for about 2 minutes. Mixture will be thick. In a separate bowl, beat cream cheese until light and fluffy. Gradually beat in the lemonade concentrate. Add the cream cheese mixture into the pudding mixture and mix well. Spoon the mixture into a pre-made graham cracker pie crust. Cover and refrigerate 4 hours.