Did a search and must have read three dozen threads on this topic but couldn't find anything matching my symptom.

2014 Z-51 A6 (VIN build 18862)

Upon cold start and an immediate turn (like when pulling out nose first from my garage onto my street), the rear end feels clunky like I'm running an old school spool in the back. Right rear tire feels like it's not turning as freely as the left. Seems to go away after a few turns. With the Z-51 e-differential is this normal?

BTW, car only has 3,100 miles (bought pre-owned with only 2,200).

Appreciate any inputs, thanks.

-Dean

 

There's an almost 100% chance your issue is caused by the non-Ackermann steering used on the C7 and has nothing to do with the differential. Search for wheel hop.

 

When I first felt what you are describing it sounded just like what had happened in my '34 street rod. It's possible that is what you are feeling, can't be sure. In that case it was the Positraction clutches in my Curie 9" Ford rear. Drained the rear, added new fluid and the proper Posi additive, the noise went away and has never returned.
Thought perhaps I had the same problem when the first cold weather hit and I made a very sharp slow speed turn with the C7; full lock when backing out of my garage. Turns out it's actually the front tires scrubbing and is caused primarily by the high performance Michelin tires, especially in the Z-51. Again because of my past experience I really felt it was the rear end.
I notice even when it is 50 to 60 degrees I feel it to a slight extent. As soon as the tires get fully warm it goes away. When it's 40 degrees and less it feels and sounds like the car is falling apart! Can't easily tell where it's coming from. Lots of speculation as to why but bottom line, folks report switching to all-season tires solves the issue. This is PDF I made that describes my investigation of the problem the first winter when it occurred: http://netwelding.com/Wheel_Chatter.pdf It defines why switching tires to a lower performance model eliminates the issue.
If you've not experienced driving the car when it's cold outside, the PDF is worth a read. For what it's worth, but may have nothing to do with your issue.
GM asked some of us early owners (my car was built in September 2013) to have our differential fluid level checked. Mine was fine. Could be another possibility.

 

Jerry,

Thanks for the link. Good stuff.

 

Jerry, thank you. Good read, too. Never figured a modern day $70K+ supercar would drive cold like it has a spool and Detroit locker rear end. LOL

 

When I bought mine I had aleady read about this phenomenon, was warned by the salesman, and there was even a little tag on the key ring describing it. Even then I was surprised at the effect. You get used to it though; just don't turn at sharp angles at low speeds.