Strabismo Posted February 5, 2012 Share Posted February 5, 2012 2006 Legacy GT Manual Transmission 80 000 km I have recently did a long drive with my car (1000 km in a day) and at the last 100 or so kms I have noticed a noise coming from under my car that wasn't there before. The noise is like a humming/ gear groaning and is speed sensitive (definitely not rev sensitive). I can't pinpoint exactly where it is coming from from inside my car but it doesn't seem to be coming from the transmission as it would have made a noise through the shifter if it was the case. There is no felt vibration. No vibration in the steering wheel either. The noise becomes very apparent as I drive at 60 km/h and up. I have lifted the car and the CV joint boots are intact. There is also no apparent play in the wheel bearings. I have drained the rear diff's oil and what came out was a very dark, almost black sludge. Is it normal for an LSD's oil to be this colour after 80 000 km or is it a clear sing that my rear diff is going? Any advice is welcome. I still have a warranty but I am 200 km from the closest dealership and I have an extremely tight schedule at work right now so I cannot afford to go back and forth to and from the dealership multiple times. I will also need to drive another 1000 km soon and I really want to fix this problem before that. Thanks in advance for any input. Link to comment Share on other sites More sharing options...
compsurge Posted February 5, 2012 Share Posted February 5, 2012 Most oil changes color over time and heat cycles. Have you checked your tire pressure? When does the sound occur: under acceleration only, light throttle, deceleration, in gear? Link to comment Share on other sites More sharing options...
Strabismo Posted February 5, 2012 Author Share Posted February 5, 2012 The noise is speed sensitive only. Hard acceleration doesn't seem to change the noise (except resulting speed change does). Putting the car in neutral and letting it cruise on its own momentum will not change the noise either. Tire pressure was checked 2 weeks ago. I can check again just to be safe. Link to comment Share on other sites More sharing options...
Max Capacity Posted February 6, 2012 Share Posted February 6, 2012 Ride in the back seat while someone drives the car. See if you can hear the rear diff of wheel bearing ? 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
Strabismo Posted February 6, 2012 Author Share Posted February 6, 2012 Tire pressure was very high due to drastic temperature chance since I last checked it (from -40 to 5 Celsius). I've set the pressure back to spec but it did not affect the noise. Link to comment Share on other sites More sharing options...
Strabismo Posted February 10, 2012 Author Share Posted February 10, 2012 Anyone experienced anything like this or might have an idea at all? Link to comment Share on other sites More sharing options...
compsurge Posted February 10, 2012 Share Posted February 10, 2012 Do you have a local shop that does free diagnosis? You could take it there and then drive to Subaru for repair. Link to comment Share on other sites More sharing options...
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