Paul, Thanks for the commentary.
These bushings are entirely different critters than the Sonoma bearing. If you look at post #3 of this topic you will see a diagram of the driveshaft setup and the #29 part which is the insulator part. Post #10 is a photo of the piece. These bushings are entirely enclosed within a "tunnel" (tube) and a typical failure would be the bearing would seize up from use and the rubber insulator would "turn around" inside the tube until it is destroyed.
These insulators are not subjected to a heavy load. They serve to keep the driveshaft centered in the tunnel tube and to reduce vibration of the driveshaft. I cannot envision any situation where the failure of one of the insulators would jeopardize the safety of anyone. Failure of one would however be a big problem for the car owner because these parts were never reproduced and have been virtually unavailable for several years.
Thanks again for your interest.
I believe the fellow I am talking with about doing this project told me that at some time he worked in a "rubber" products manufacturing facility which would indicate that he has some higher level of expertise.
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