Remove the old boot from the shaft. Install a new one
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
Check the inner track snap ring. Replace if necessary.
Tap the inner bearing track on to the joint. Use drift 9992413 .
Check that the snap ring is seated in its groove.