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I also have a GC SR V8 and have a similar experience as you, everything has been flawless except a vibration and drone with MDS under light load. Haven’t taken it in yet. What did they find with yours?
I just picked up my two row GC Hemi and am experiencing the same thing you describe, specifically in the 1300-1500 rpm range. Did you end up getting this resolved? If so, what was the cause?