This is from a dealer bulletin. My housing/knuckle had to be replaced a while ago. (on warrenty) Hi Ho...

Replacing AWD Rear Wheel Bearings
on Legacy, Impreza and SVX.

When replacing rear wheel bearings
on all wheel drive Legacy, Impreza, and
SVX vehicles, be certain not to over-torque
the lateral link bolt that secures
the two transverse suspension arms to
the wheel bearing housing. Do not use
air tools to tighten the nut. The proper
torque is probably less than you think.
Since the torques are different for the
different models and years, refer to the
appropriate manuals for the proper
specs for the vehicle you are working
on. If this bolt is overtorqued, it can
deform the housing and may lead to a
repeat failure of the wheel bearing.
If you encounter a repeat failure of a
rear wheel bearing occurring in an
unreasonably short amount of miles, the
housing may have been deformed dur-ing
the first repair. Replacement of the
bearing and the housing may be
required.
There are some other things to remem-ber
when working on the wheel bear-ings.
Never loosen or tighten the axle
nut with the weight of the vehicle on the
wheel. The vehicle should be in the air
with the wheel removed prior to loosen-ing
or tightening the axle nut. If this
precaution is not taken, damage to the
wheel bearing may occur. The axle nuts
are not reusable. A new nut should be
used with the new bearing. Always
insure that the new bearing is properly
packed with suitable wheel bearing
grease. The grease that the bearing is
shipped with is not sufficient. Always
use the proper special tools to install the
bearing and torque the axle nut to the
correct specifications.