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.
Install the rear differential front member with a new self-locking nut.
Tightening torque:
T1: 50 N.m (5.1 kgf-m, 36.9 ft-lb)
T2: 110 N.m (11.2 kgf-m, 81.1 ft-lb)
Fig 1: Rear Differential Front Member Self-Locking Nuts With Torque Specification