WARNING: This page is about a different car, the 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Pressing Off 3rd Gear
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Remove circlip before pressing off.
Pressing off 3rd gear wheel with 2nd gear sliding gear.
A - Separating device 22... 115 mm, e.g. Kukko 17/2