Tightening sequence:

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: Identifying Alignment Sleeve And Front Final Drive Cover Bolts

GW00006173

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1. Stage: Tighten bolts - 1 - to - 3 - by hand

NOTE:

When tightening bolts by hand, make sure the housing gap between cover and transmission housing decreases evenly around circumference.
2. Stage: Tighten bolts - 1 - to - 14 - in specified sequence to tightening torque

Check ATF level and top off → ATF level, checking onward.
Install center differential.