So here is the wiring pin outs from the Upfitter electrical manual
From this you can see it's pins 7,8,9,10 on the behind the right side connector (behind the DIC controls) that we want to rearrange to flip flop the volume and track controls from right to left.
What I noticed when I was checking the buttons was that my OEM volume control wiring (stock volume control buttons) was ordered different than listed, Grey-brown is listed as volume down but it was volume up and Red was listed as volume up but it was volume down. So I'd recommend that you test your connector also to make sure you are swapping the pins based on as they are operating and not just as the manual lists. The manual listing that location 7,8,9 and 10 is correct.
What I did was connect a meter to the ground PIN 6 on the wiring side and the press the volume up and verify what wire/connector location that was working at, then did the same to locate the wire/location for the track up and then swapped the wires. Then did the same for volume down/track down wires.
You will need to remove your airbag from the steering wheel but you don't have to disconnect it completely- be sure to disconnect your NEG battery terminal for at least 20min before working around the airbag, just in case.
Then pop out the rear buttons on each side, you can leave the buttons connected. Behind each button is a torx screw and a metal plate. Remove the screw and plate on each side.
Then gently pry out on the front buttons and trim that goes around the lower front of the steering wheel below the airbag. It will feel tight and the trim has "location" pins that grip onto the leather you'll need to use force but there's nothing like pop clips holding it in, it's just really snug. There are connectors behind both front side controls. It's easier to disconnect both sides and remove the front trim completely to work, the locking tabs for each connector is at the bottom of each connector.
Here's a how each side of the connector and wiring looked when I was done.
What made it operate correctly for me was the following pin assignments
7 - yellow-red
8 - yellow-white
9 - grey-brown
10 - red
****PLEASE NOTE**** test your own wiring operation as my truck may have just been weird. lol
Also, I think it goes without saying on these boards/tutorials but - I take no responsibility for you mucking your controls up
Sorry I didn't take more pic of disassembly but I was so stoked to tidy things up and try it out that I didn't even think about it, lol.