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Trans noise final diagnosis before buying a trans
Posted 16 January 2013 - 08:55 PM
To me this means front pinion bearings, some bearing on the front pinion drive shaft, rear output bearing, or maybe the driveshaft carrier bearing.
Noise disappears with removing the load (just enough throttle to coast, or just coasting), amnd noise was not changed at all by inserting the FWD fuse (FWD light lit).
Other than trying to hear the noise with the car on stands, then inserting the FWD fuse and stopping the rear wheels, any other way to absolutely rule out the rear shaft bearing in the tailhousing or the carrier bearing?
Posted 17 January 2013 - 07:14 AM
Posted 17 January 2013 - 07:56 AM
Mechanics stethoscope on the rear carrier bearing while turning the driveshaft via the rear wheels?
It's tough to get to, it's almost impossible to see, really.
The noise is loudest in the car just above the shifter, which is just above the carrier bearing, but because of the console and firewall is also the best place for noise from the front to sneak through.
Posted 17 January 2013 - 09:17 AM
If its a very light whine I would wait it out and see if it gets worse.
Posted 17 January 2013 - 09:33 AM
The 'pinion noise' vid is from last week, the others from today.
In person it's easy to tell the trans noise from the wheel bearing noise, on vid not as easy.
Posted 17 January 2013 - 10:23 AM
Posted 17 January 2013 - 12:15 PM
I'm very familiar with just about every scraping noise after 150,000 miles in this car.
Posted 17 January 2013 - 02:52 PM
front diff noises get worse rather quickly so this sounds about right.
It's gotten worse in about a week (so about 500 miles), it now makes a little noise at some points during decel.
pull the front axles and run RWD!!!
that should verify front diff/pinion once it's not loaded.
Posted 17 January 2013 - 03:51 PM
It certainly sounds final drive related. Hard to say for sure. You might take it to a good reputable mechanic in your area that could confirm the source of the noise.
Posted 17 January 2013 - 04:26 PM
yep, i've done it. still way easier than swapping a trans. with two used/bad axles as donors and disconnecting one wire it's a quick job, could be done in no time.
Only problem with that is you have to disassemble the front axles
but of course this is all silly talk and not what he wants to do.
Posted 17 January 2013 - 05:01 PM
I think with the front wheels on it'll load the noisy part enough I'll be able to hear it.
Posted 19 January 2013 - 05:31 PM
I think this is definitive, front pinion bearing.
I also confirmed even in 1, there is NO drive to the rear wheels until you step on the gas (whern I had all 4 off the ground, heh)
Posted 20 January 2013 - 02:54 AM
Posted 20 January 2013 - 11:46 AM
Posted 20 January 2013 - 04:32 PM
The H6 cars have 4.11 final, like a 4EAT legacy, the other outbacks have 4.44.
I wonder if I can sell any bits out of this trans... it only has 200,000 miles on it!
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