Maybe I am misunderstanding what you are saying, but you can change the shift points on the transmission. And it works on an 04. It should do the same on all years.
The SC3815 doesn't have the memory capacity of the SC3865 which can actually tune the trans to vary degree depending on the vehicle year. The SC3815 only allows you to bump the shift point depending on what the rpm limiter is set for.. Both SC 3815 and 3865 have been replaced with newer more robust units and are no longer offered. The SC3815 is a excellent tuner for the 03 as it is all that can really be used for that year. The SC3815 can be used on newer trucks but will not support the add-on trans tuning package due to lack of memory.
I use the SuperChips Cortex 3950 Tuner on my 07' Ram and I love it. I run the 91 octane tune and 93 octane fuel. I also installed the canned transmission tune that goes with the 91 octane tune. Very much improved shifting and performance.