After I started pulling my 15,000 # GN horse trailer with my '01 3500 auto, I decided I wanted more truck, so I took a serious look at the new International 4200. I was able to test drive 2 different trucks, a 7 speed (Eaton/Spicer) and an automatic (Allison). Both trucks had the DT466 inline 6.
The Allison truck felt like I was driving into a headwind. The engine revved, but the truck just didn't go like I thought it should.
The 7 speed truck had very good pick-up and felt much stronger than the Allison, but the transmission was hard to shift. The DT466 torque curve is narrow, and you need to shift often. Downshifting, even when double clutching was difficult. The transmission just didn't want to go into gear.
Neither truck was comfortable or easy enough to drive to be a daily driver. I realized that the medium duty truck route would not work for me, so I decided to try an '04 6 speed HO. After the Internationals, it felt like a sports car. The power level is a nice upgrade from my '01, and shifting the 6 speed is a pleasure.
For those interested in a medium duty truck as an every day ride, make sure you drive several first and can live with the ride, handling and feel. While the new ones are much improved, they are still "trucks". The Dodge just feels so much more refined!