[travelin texans]

On a diesel engines tuners/programmers can make ridulous amounts of up/torque & most of the engines can handle it, not so much the transmissions. On gas engines I seriously doubt you would notice enough difference to justify the price. Yes you can add cold air intakes, free flowing exhaust for fun, but again won't notice much if any benefit. Personally WOULD NOT tune my diesel or gasser.
As for a tranny flush, NO, drop the pan change the internal filter if it needs it (check manual for trans filter change intervals) at a Dodge dealer or transmission shop, not some quick oil change place, flushing just moves the crap around.
These are my opinions! Been doing my own maintenance forever, now to old to crawl around under them & don't enjoy it as much as when younger.