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2017 A8
Infamous shudder emerged shortly thereafter.
First TSB [but wrong fluid] flush.
Shudder gone for a short time then returned.
Dealer determined TC replacement necessary [using same old fluid]- swap out TC.
Temp fix- shudder returned. Grounded the car till I could get an appointment, so as to not burnish the TC.
NEW TSB fluid flush- problem solved many miles later still no shudder. However occasional loud "clunk" felt in the firewall- downshift here and there. Allegedly according to GM...normal for this transmission, which in my opinion is a brute. Still like it though.
Final thoughts: you definitely need a new TC. Just check how long their warranty repair covers the new part.
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