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I know that Infotainment makes the upgrade to the 8.4 a direct swap all plug and play. I'm still waiting for someone to come out with the steering wheel control upgrade first.
I've gone back and forth a few times myself. my first Cummins was a 2005 5.9 ST 4 door long box G56 6 speed. Turned that into a monster. Made 702 HP at the wheels back in 2006, ran 12.92 in the 1/4. I had a 2016 Power wagon 6.4 hemi. Then moved to the 2010 6.7 mega cab. Now to the 2020...
I'm in the same boat. Naturally assumed this was standard now on all vehicles. I am looking to add steering wheel controls to my 2020 Tradesman. Ill probably upgrade to the 8.4 once i get the controls done.