Vancouver Bob
Full Access Members
https://www.ringpinion.com/b2c/DiffDetails.aspx?DiffID=319&SearchMode=Diff&TypeID=4
"Compatible with Models:
Expedition: 2003 - 2013 (Rear)
Navigator: 2003 - 2014 (Rear"
https://www.yukongear.com/partcats.aspx?SearchMode=Diff&TypeID=4&Type=Ford&DiffID=319&DiffName=Ford+9.75"+IRS
http://www.expeditionforum.com/threads/aftermarket-limited-slip-for-9-75-diff.2052/#post-9293
http://www.expeditionforum.com/threads/aftermarket-limited-slip-for-9-75-diff.2052/
Thanks!! I've stumbled across the Yukon in my searching and is definitely a possibility. Had hoped to be able to get one of the selectables to work and not ready to throw in the towel just yet .