I installed my factory backup cam yesterday into my '13 sport with the 8.4A radio. Came out perfect!
For anyone who may want to do it - here are the parts needed.
Wirinig/Harness - http://ramharness.com/shop/2013-2014...camera-harness
The harness is made by a member on another forum and is all plug and play!
Camera/Handle/Wiring - http://allmoparparts.com/1500-backup...om-p-5059.html
Instructions step by step - http://ramharness.com/Hosting/DIY_ad...a_wo_Video.pdf
This was VERY simple. The instructions are clear as day and once you install, just take it to the dealer and have them "wake up" the camera. Sales code XAC.
Mine works perfectly just as if it came from the factory!