The 4th gen trucks all have the 11. 5 AAM rear axle. The 2500 GVW is 9600 lbs, 3500 is 10100 lbs.
The 4th gen trucks have a lot more creature comforts. I am not an automatic fan, but this new auto is great. The exhaust brake works as good if not better than the one in my last truck with a stick, i'm impressed. Sam