I bought this dana from a mud bogger and it did look different than the 1s I have seen it has HD inside the case and extra ribbing on it one person told me that its a Super dana 60 ?? .
Dana 60HD. Internals are the same as the normal ones, just has some extra ribbing on it. Should be stronger than a normal casting, but not sure how much. Pretty easy to find - I see them in boneyards all the time and have a complete one in my garage
I have the same HD housing built by Strange under my Demon. I've been told there are "almost" indestructible. We will see, drag cars are hard on rears with a transbrake.
Every dana has a stamped number on it somewhere around the center section, usually in he front off to the side. Find it, go to the Dana site and look it up.