Message: I have a 01 durango with a 3.55 open case rear end, I want to install a detriot EZ locker or a powertrax no slip unit, But I am not sure what type of axle I have? The diff cover has 12 bolts and 27 spline axles if that helps. Is this a Dana 30, or 35, or 44?, or somthing else, I dont know. I do have 4wd. thanks.