We purchased a used vehicle with DRD tunes already on it.
I don’t know much about it, honestly.
I do not know if I have a transmission tune or not.
Recently, it has started shifting hard if I let off the accelerator, let it coast, and press the gas again around 30-35 mph - the had shift occurs.
Also, when downshifting with the exhaust brake on, it seems really hard.
Built transmission before we got it.
2017 RAM 2500 6.7L Cummins.