TY758 (5MT) Whirr

[TimothyOnline]

'09 Legacy 2.5i Special Edition EJ253 / TY758. For the last week or two I've been getting a noticeable whine that:

 

-does *not* vary w/ engine RPM

 

-does *not* vary with the clutch engaged / disengaged

 

-does vary with wheel speed

 

A couple nights ago I put four jackstands under it, got it up to 3rd gear, jammed the accelerator w/ a two-by-four and crawled under it with a stethoscope:

 

-When sitting in the front I can hear the whirring

 

-Left-hand wheels I could *not* get to stay turning

 

-Right-hand wheels I could get to spin; aside from some spinning noise (*whoosh*) I didn't hear anything from the bearings

 

-At the front of the transmission / front diff / center diff assembly it was mostly spinning noise (*whoosh*) and a hint of a whirr

 

-At the rear of the transmission / front diff / center diff assembly and aft mount I could clearly hear whirring

 

I drained the old Redline 75W90NS fluid 9000 miles early (only 21000 miles on the fluid; was dark grey in the waste container) and filled it w/ fresh Mobil 1 75W90LS fluid.* That did a little to quiet the whirr, but I can still hear it.

 

What are your thoughts?* Center diff bearing?* Output shaft bearing?

 

If I'm missing a thread where this has already been covered, kindly reply with a link. Thanks in advance.

 

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