Is it a posi 8 3/4?

Hey everybody,

I know that on any rear end if you turn one tire and the other one turns the same way then it's a posi. What I don't remember is if it matters whether or not the drive shaft is installed. I'm just trying to find out if the 8 3/4 in the Dart we bought is a posi. It took just barely over 3.5 turns of the pinion yoke to make one full revolution of the tire so I'm guessing it's a 3.55/1 gear ratio, I was glad to see that, that should be a pretty decent all around gear ratio. Anyways, thanks in advance for any information! I hope that everyone has a great day!