The air suspension on that Dodge must be nice, I rented a base model 6.4L 2500 and it bounced like a tractor when empty.
My LX rode amazing and especially over speed bumps or other large bumps it would just float. Then I put on a set of Ridge Grapplers and bumpers and it's more rough now. Still...
Drive a couple and see if you notice the difference. The power increase is from 4000 RPM onward, so when the early engines are shifting to the next gear; the VVTI engine keeps revving. The big thing is the 5-speed transmission, it's way better than the 4-speed. 5-speed was introduced in 2003...