My rear started making a VERY loud clunking noise on acceleration and hard braking a while ago. I took it to Dutton Motors out here in Riverside a few days ago and just picked it up. There is now zero clunking and whining
After reviewing the invoice, it says "r+r rear diff for access to replace support bushing and road test"
I don't think they upgraded the diff to the '06+ model but whatever they did I'm more than happy with the results