Need that link again to the website stating the problems with the rear ends. Mine is just getting worse vibrating everything from speeds 60-75. I want to go into the dealership showing them the papers with the diagnosis in hand.

 

http://www.cadillacfaq.com/faq/index.html

this one?

 

There's a service bulletin on vibration in the driveshaft.

So far, I've escaped the vibration issue, but just had the complete carrier replaced due the failure of the ring and pinion.

My dealer told me that they would take care of the driveshaft should it start acting up.