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#1
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Strange noise coming from the rear
Hi all,
I posted a tread early about a high pitch whining noise while driving. I finally had some time to do some further trouble-shooting. I checked underneath the car and did not find any vibration related causes. I then rotated tires- no change in noise. Put in FWD fuse and noise went away. For now I am pretty convinced the noise is coming from somewhere in the drive train. I had also changed the fluid in the rear differential and checked the plug. I found no evidence of gear damage there. I also pushed and pulled on the drive shaft all the way back and everything seem to be OK from what I thought. The strange noise appears to change pitch/frequency when driving the faster I go the higher the frequency. It is throttle related- if I let of the gas, it changes briefly, and then it comes back. Any thoughts as to what in the rear/drive train that could cause the noise? |
#2
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Clutch packs are the only thing that really have anything to do with the rear driveshaft. Perhaps these are worn out. However, a high pitched noise doesn't really go with them being worn out, but it's possible.
__________________
-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#3
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Clutch packs
Jason,
Thanks for the reply. When you refer to clutch packs, are you talking about the clutches in the transmission or what? If so I assume these clutch packs transfer the load/torque to the rear wheels as needed, is this correct? |
#4
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Yes, but to be completely honest, it sounds like a differential failure in it's premature stages. Are you showing any transmission codes?
To |
#5
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Quote:
__________________
-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#6
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Strange noise from the rear
Thanks to all who replied,
I do not have any codes that I got out of the car. I went through previous maintenance history on the vehicle that previous owners left. It looks like the rear differential had leaks and it may have pretty much run out of oil before. The vehicle last summer went from Colo Springs to Alaska and back. I am afraid that the rear diff may have been oil straved at some point. How much would it cost to have the rear diff rebuilt? Does anybody have an estimate? |
#7
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Quote:
A rear diff will roar as it gets worse (and i do mean roar), and it usually takes a long time for it to self destruct. The reason that it went away with the fuse in is because the differnential was no longer being driven by the driveshaft, it was now driving the driveshaft. This changes the force of thrust from one side of the gear to the other (which has less wear). Its hard to determine a bad diff by examination if you dont really know what your looking for when it first starts. You usually need to but a dye on the gears and see how they mesh. Thats why mechanics take a wait and see attitude with the diff. If it is the diff, it will get worse with time. Just an FYI there is also a carrier bearing on the driveshaft on most soobies, as the driveshaft is in two peices with a set of universals. When this goes it is a clunk in the middle of the car. nipper |
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