I just had my coach serviced at the local International dealer (hugh dealer) and was told that all of the 2500's are 5 speeds. I was told when I purchased mine it was a six speed. I spoke with the service writer for a while trying to figure out a way to bring down the cruising rpms (I have the 5.29 gears) and he never mentioned converting to a 6 speed. Has anyone had this done? I don't know how you would do it.
Relating to your first question, I have a tuner installed that I will have to verify the name of, I beleive it is an M8. I can not tell anydiference with it turned on or off but I have not towed my trailer yet which is where the difference could be found, will let you know.
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