channoff Posted April 12, 2013 Share Posted April 12, 2013 If this is wrong forum, let me know. I have a new whirring sound that is definitely in drivetrain/transmission somewhere. It increases/decreases as car speed increases/decreases. It is somewhat louder when clutch is engaged, but still there when disengaged. It is also louder when accelerating. I thought it might be my leaking axle boot, but I had that replaced today along with front tranny service/fluid replacement. It's hard to search for "whirring" as sound is subjective. Initial thought are wheel bearing or, unfortunately, throwout bearing. All I know is the sound wasn't there a week ago and now it is. Any help would be appreciated. '05 LGT 5 speed Link to comment Share on other sites More sharing options...
channoff Posted April 12, 2013 Author Share Posted April 12, 2013 Also found out front rotors are cracked...WTF??? Anyhow, I am starting there for the sound. Stay tuned... Link to comment Share on other sites More sharing options...
_karu_ Posted April 12, 2013 Share Posted April 12, 2013 This reminded me of my 5MT Civic. It's either the throwout bearing or the input shaft bearing. I think the rule of thumb was, throwout bearing when you engage (foot on), and input shaft when you disengage (foot off) the clutch. Mine was the input shaft bearing, the more common one. Link to comment Share on other sites More sharing options...
channoff Posted April 18, 2013 Author Share Posted April 18, 2013 Looks like center diff bearings Link to comment Share on other sites More sharing options...
cseagle08 Posted April 19, 2013 Share Posted April 19, 2013 Looks like center diff bearings Did you get them replaced and it quit? I have this same exact issue right now, i'm trying to figure out what it is before I do something about it. (and driving the other car in the meantime) Some days it makes noise, some it doesn't. Seems to be when it's cold outside that it makes noise. Link to comment Share on other sites More sharing options...
Subaru_Lover Posted April 19, 2013 Share Posted April 19, 2013 Wow. This is the exact same problem I'm having with my 1992 Legacy. Automatic transmission. AWD. 4-door sedan. I posted in the First Generation Forum --http://legacygt.com/forums/showthread.php/1992-subaru-legacy-sedan-whirring-noise-while-accelerating-helpi-206046.html There might be feedback there eventually that will help, but I'll keep posted here as well if anyone has anything to add. Link to comment Share on other sites More sharing options...
channoff Posted April 20, 2013 Author Share Posted April 20, 2013 I am not too sure if issue would be same in auto tranny. I am traveling too much over next two weeks to replace, so I reserved a car lift a couple weeks from now and will replace the bearings in a few weeks. There are a few other threads in here about this, but, from what I can tell, it's mostly 4th gen LGTs with manual transmission. From what I can tell, it's 3 to 4 hour job to replace the bearings if you have right tools and a car lift and a 6 to 10 hour job on jack stands. The good news is that it's an inexpensive fix. Total cost for everything is about $160 (and $125 for me to rent a car lift for 5 hours). Link to comment Share on other sites More sharing options...
channoff Posted April 20, 2013 Author Share Posted April 20, 2013 cseagle, I know I have come across some threads in here with cold start/cold engine whirring that goes away after warming up. Not sure that is going to be your center diff as my whirring sound is all the time, cold or warm. And it keeps getting louder over time. Doing my best to drive it as little as possible before I shred a bearing and do a lot more damage. Link to comment Share on other sites More sharing options...
channoff Posted April 20, 2013 Author Share Posted April 20, 2013 Here is a good link over at nasioc about the center diff: http://forums.nasioc.com/forums/showthread.php?t=2071286 The link above even has a few mp3s of the sound which is identical to my sound. and a good one on this site: http://legacygt.com/forums/showthread.php/legacy-2-5gt-center-differential-bearing-swap-204445.html?t=204445&highlight=center+differential+bearing Something else that can help you diagnose is jacking up entire car with jack stands, have a friend take car up to 30 mph, and get under car with a $7 mechanics stethoscope from Amazon. I just bought this one to help me diagnose: [ame=http://www.amazon.com/gp/product/B0037UUMO4/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1]TEKTON 5888 Mechanic's Stethoscope - Amazon.com[/ame] Link to comment Share on other sites More sharing options...
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