It’s a Dana 60, a Dana 70 or 80 will taper down right before the drum backing plate. Dana 60s generally don’t unless they’re a Super Dana 60 but those are rare in the Dodge trucks and really only way to tell is the thickness of the tubing wall. It’s over 1/2 inch thick walls. The super Dana 60 is what I cut down to fit my dart. With massive 35 spline axles. If I somehow break an axle, I’ll be really amazed.