WARNING: This page is about a different car, the 2004 Nissan Altima, 2003 Nissan Altima, and 2002 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
Check for halting movement or a noticeable rattle by moving a joint part vertically, horizontally and to axial direction.
Check for crack damage and grease leak of boot.
Fig 1: Checking For Crack Damage And Grease Leak Of Boot