So I took my car to the dealer (at their request) on January 13 so they could perform some more tests in conjunction with PCNA technical folks. A week later (Jan 20), after taking many recordings using chassis ears and sending them to PCNA, the dealer finally got the OK on Wed to proceed with replacing the transfer case. It arrived Fri and they installed it, but need a special clamp to finish the job on Monday when I should get it back. So this is the fourth Macan on this thread that has needed the transfer case replaced. I have PTV, but I don't think it is associated with the transfer case. The symptoms of shuddering in the drive train showed up best when performing a series of slow sharp turns in a parking lot. After they'd show up, then the thumping under straight line acceleration would also show up.
It amazed me that PCNA required so many time consuming tests to identify the cause when at least 3 cars on this thread had exactly the same symptoms and ended up, again after much testing, having their transfer cases replaced to solve the problem. I told my SA to tell PCNA to talk to Suncoast and Pacific Porsche where 2 of the cars had been involved. You'd think that the benefit of having a centralized technical support team would be to avoid each dealer having to conduct the same time consuming tests to solve a problem already identified elsewhere. I was bothered more by the principle than by any inconvenience to me. After all, they gave me a 2016 991 Black Edition C4 cab as a loaner, which I've really enjoyed driving.
2015 Macan S - Silver on agate, gloss black trim, leather package, PASM, PTV, Premium, 18-ways, Infotainment, Bose, 19" Macan Design, comfort lighting, compass
1996 993 C4S - Polar silver
Gone but not forgotten: '06 911 C2S cab; 07 911 Targa4S; 05 911 C2S cab; 05 C55 AMG; 01 CLK55 AMG; 70 MBZ 300SEL 6.3; 78 BMW 633 CSI