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Old 11-22-2006, 06:48 PM   #1
rs6er
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Member#: 55660
Join Date: Feb 2004
Chapter/Region: Tri-State
Location: NY
Vehicle:
2007 Legacy SpecB
DGM

Default How can I tell if my rear diff is shot.

I recently changed the rear diff oil to Mobil 1 75W90 Gear Oil. I filled it till it overflowed and put the plug in. It hasn't leaked. Shortly thereafter I started to hear whining from the back of the car on the highway, particularly in 4th or 5th gear. If I push in the clutch it still whines. If I let up on the gas abruptly there's a bit of a clunk. Is my rear diff shot or is it something else?
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Old 12-01-2006, 04:01 PM   #2
paulgsch
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Member#: 129388
Join Date: Oct 2006
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It's the fluid that is causing this. I put the RedLine in my rear diff and now it is making noises. The only thing you can put in the rear diff is the Subaru LSD oil.
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