OK, GM had quite a few complaints from CTS-V owners and that is what drove the "Special Coverage". This is not a recall!!
Truth is ANY LSA will make noise when "lugging" the engine( low RPM with a load ie; parking lot/2nd gear). In most cases not a problem but GM is legally paranoid!
The Coverage has been extended to all LSAs but the issue with the coupler was fixed before any ZL1s were sold.
For those of you that have taken advantage of this, good job, but really not needed.
The problem engines sounded like rattling a box of rocks ALL the time.