Posts 22 & 23 updated with some ACC install instructions.
Extra info for those that want to add lane assist along with ACC:
If you ALREADY HAVE adaptive steering, you just need to swap in the correct 12” screen that has the lane assist button (and no, you can’t get away with adding lane assist without having the physical button).
12” screens with lane assist button:
2019-2021 Cummins (Uconnect 4 only)- 68370849AC
2019-2021 Hemi (Uconnect 4 only)- 68423810AC
2022+ Cummins (Uconnect 5 only)- 68526611AB
2022+ Hemi (Uconnect 5 only)- 68526610AB
If you DO NOT have adaptive steering, in addition to the screen you need to swap out the steering gear box for the one with torque overlay- 68507900AB
Jumper wiring to connect steering module- 68485757AA (for 2019, you’ll need an additional custom harness)
The intermediate steering shaft (the one that connects to the gear box) is swapped out for a shorter one- 68427394AA
These are all the settings for lane assist:
VehConfig 7: Lane Departure Warning Present- YES
CustSetMenu 1: Lane Departure Torque CSM Present- YES
CustSetMenu 1: Lane Departure Warning CSM Present- YES
P/T Chassis Net: EPS Electric Power Steering- ENABLED (already set on adaptive steering equipped)