I had a whine develop in my '05 GT (manual trans.) at about 150K miles. The dealer checked it and said the transmission and clutch were fine. They disassembled the rear and replaced the bearings, shims, races etc. and added xl-3. They said the ring and pinion were fine. That cured most of the noise, but I'm still get some whine in 4th gear when I let up on the gas(cruising). If I give it a little gas, the noise stops completely. I took it back and rode with the mechanic who did the work. The dealer seems reluctant to do more and this was an expensive, non-warranty repair. I'm wondering if I could either request Ford to have another dealer take a look at it or possibly have another shop troubleshoot their work and try and get Ford to reimburse me. Any suggestions?