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I finally got under the can and fixed my problem. I posted the details in my thread but long story short, the guibo was starting to come apart, some chunks missing, cracking and a light amount of threads sticking out. However the CSB was totally shot and the drive shaft just bounced around in the housing. When I grabbed the drive shaft and moved it I could hear the same sound as the rumbling noise so I would say it was more the CSB causing the sound over the guibo. But since you are in there, might as well do both. That is what I bought both parts after I confirmed it was definitely the guibo coming apart. (you can see that easy without removing the heat shields.
No not yet and it still bothers me. I have been so busy doing other things but it is one thing that I need to fix. When I do I will update the thread. I need to fix my truck a/c this weekend but if I have a chance I will get under the car and see what I can see. People are leaning it is the guibo and/or the center bearing and mount. I'm still not totally convinced but the vibration does seem to make sense from those areas. I looked into getting all the parts for both jobs and looking at about $150. I hope I can see these two parts without having to drop the heat shield which means I have to drop the exhaust. I know for the repair I will need to do this, but don't want to have to do this twice just for me to order the parts.