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I know you have to get the little box that plugs into the port below and use the obd wizard spftware and it’s in there. It’s actually where I increased top speed from 88 or 90 to 125mph too.
The actual hardware is missing inside the door for that function. You can change the setting with AlfaOBD, but the hardware is not there on the newer trucks.
A few threads about it on here.