Quadra-Drive II is not available with the V6. During the September 8 chat with Jeep engineers they stated that the V6 driveline was not compatible with Quadra-Drive II. Search the chat for their responses, or here is one link about it; see my Post #6:
Why no Quadra-Drive II on a V6?
It was frustrating for me to discover this, since the June/July 2010 'Build Your Own' Jeep sites had allowed you to configure the V6 with QDII (I have printed PDF outputs to prove it). Anyway, that is history now.
Quadra-Trac II with my V6 had been fine through the past winter.