4kq center differential noise

[William Perron]

Experiencing a whirring/turbine/bad bearing noise from
the center differential area.  Related to road speed.
I had read previosly on the list that this might be
the front CV joint on the center driveshaft, or
possibly a bearing in the center differerntial.  I
finaly was forced to drop the center driveshaft due to
the failure of the center support bearing.
Unfortunately, the whirring noise is still there
without the center driveshaft installed.  It is
definately coming from the rear of the center
differential.  I know that a few of you had tackled
the replacement of the rear bearing in the center
differential.  Any tips/procedures would be
appreciated as well as approx cost of bearing- i.e
does it make sense to install a complete used
transmisison?  Can the bearing replacement be done
with the transmission still in the car?

PS- I was able to drive the car around town w/o the
driveshaft w/ the center differential locked.  It did
not want to stay locked at highway speeds though.
Would this indicate a weak differential lock servo?

Thanks,
Bill Perron
'85 4kq sans center driveshaft
'95.5 S6 Avant

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