WARNING: This page is about a different car, the 2010 Audi A8, 2009 Audi A8, 2008 Audi A8, 2007 Audi A8, and 2004 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Checking Converter Hub For Wear Grooves
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Check converter hub - arrow
- for wear grooves.
NOTE:
The torque converter is welded together and must be replaced as a complete unit if it is damaged or faulty.