I can not speak yet for the new 8 speed, since I am waiting for the Ram 1500 Diesels to come out, and they have the new 8 speed. I currently tow with a Jeep Liberty Diesel, with a 5 speed,and my towing experience is not the best, but it works well for me right now.
The 8 speed has some real nice gear ratios, and I really can't wait to tow with it. I will link you to the chart I made, although it does compare my Jeep to a Ram 1500, but you will get an idea.
https://dl.dropboxusercontent.com/u/50165289/Liberty%20VS%20Ram%20Gearing%20Chart.pdf
