Dealer phoned me back and there is a way to accomplish using the RB4, Sirius, and Uconnect. You need to order a splitter/multiplexer and a Y cable according to Dodge tech support - it's not documented.
The dealer has them in stock (for other applications), so if you are interested I'll send you the part numbrs after I install them.
I have a factory installed RB4, and factory installed U-Connect. I installed the factory spec Sirius afterwards and needed the Sirius receiver, the Ram installation kit, as well as the two additional parts:
It was the two additional parts that allow the Sirius and U-Connect to work together off the same radio.
It all works perfectly now!
With the RB4 and the factory Sirius you do not get the display info from Sirius to show up on the RB4? I have hears lots of conflicting reports. Some say that if you use the multiplexer it will display?
Also what parts are included with the Uconnect? I am wondering what it would take to add it. Does the Uconnect display call info an the RB4?
For Bradleykavin, theres no way to connect the factory Uconnect to the AVICN-2. You will have to go about it with one of pioneers hands free kits. Uconnect only works with factory equiped radios and not aftermarket.