youll find out ... the case will not lock untill you get on the gas..its awd not full lock
simple test : goto 4wd low lock ...drive it alittle so you know its in... put it in park...use a floor jack and jack the rear up slighly. ... get in truck,go to drive,release brake.... whats happening ? oh yea the rear tires are spinning ! if it was a true lock the truck would want to go forward and or rear tires would not be spinning .