HYPOID Gear Backlash
WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Adjust the backlash by turning the side retainer in the RH side case.
ST 18630AA010 WRENCH COM PL RETAINER
NOTE:
Each time side retainer rotates one tooth, backlash changes by 0.05 mm (0.0020 in).