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Old 05-11-2016, 05:00 PM   #1
ImprezaZRoss11
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Default Viscous coupling slipping?

I just spent a lot of money at a transmission shop on my 2006 Wrx.

Among the things was a new (used from junk yard) transmission, and clutch. Get the car back and it feels like the clutch is slipping in 3rd-5th gears at full throttle from 2.8k rpm to about 3.3k rpm (the fun part!)

They double checked the car over and swear it's not the clutch. They say it's the viscous coupler. Apparently when a transmission sits for a long time with no oil it take some time for it to work its way into the viscous coupler? And they say it should go away after a few days? Does this sound correct?
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Old 05-11-2016, 10:46 PM   #2
JarHarms
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BS
The center diff that Subaru uses employs a sealed viscous unit. The transmission gear oil never reaches the viscous fluid trapped inside there....sort of the point. The remainder of the center diff is an open spider gear arrangement which is bathed in the transmission gear oil. Google some photos of a phase2 5MT center diff and you will see what I mean.
Did the used 5MT match up to the rear diff ratio?
Was the clutch used also or brand new?
Was the flywheel resurfaced correctly or replaced with new?
Was the clutch release system bled out correctly?
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Old 05-11-2016, 11:58 PM   #3
ImprezaZRoss11
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Thanks for the info. I will talk to the shop that did the work. New clutch was put in. Transmission out of a 2006 Wrx in as put in so I assume thcan ratio should be the same. And they resurfaced the flywheel.
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Old 05-12-2016, 07:49 AM   #4
Titter
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built motor? stock clutch?

maybe youre putting too much power through your drivetrain
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Old 05-12-2016, 10:40 AM   #5
ImprezaZRoss11
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Maybe I misunderstood the mechanic and they replaced the fluid in The VC? They put a stronger clutch in it, but I'm only running about 280hp.
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Old 05-12-2016, 11:12 AM   #6
Max Capacity
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The VC is a sealed unit, you don't replace the fluid in it unless they took it out of the tranny and opened it up. Highly unlikely...

When my VC went I lost AWD really no way to notice other then wet pavement or snow. The car drove fine. The Snap ring broke and the VC fluid leaked into the 5mt. I noticed my 75w-90 was a gray color and the bearings began to get loud. They didn't find the VC had failed until the tranny was apart.

What your describing sounds like a slipping clutch. Put the car in 5th gear on the highway, and the throttle to wide open, if the rpm's climb faster then the car is going forward as it used to, that's a slipping clutch. You'll know right away.
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Old 05-12-2016, 11:50 AM   #7
WoodsWagon
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lots of junkers

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Other option is an axle not seated in the diff. If the axles are not clipped all the way in, under load they can pop out far enough to disengage the splines. Feels like a slipping clutch as the AWD system compensates for the spinning axle. Easy enough to check, just tug on the inner joints to see if you can easily slide them back partway out of the diff. Check front and rear, the rear diff is more common but they did just have the front apart.

Their line about waiting for oil to work into the VC is pure BS, it's a sealed unit.

What was the problem with the previous transmission by the way?

Last edited by WoodsWagon; 05-12-2016 at 11:55 AM.
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Old 05-12-2016, 12:06 PM   #8
Bikelok
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I agree with previous posts.
It's either the clutch or an axle is not seated.

Good luck and let us know how it turns out.
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Old 05-12-2016, 12:39 PM   #9
ImprezaZRoss11
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Thanks guys. I'm gonna talk to the shop. Wife was driving the car and she said the car went "bang" when she shifted pulling out of work through each gear change. She pulled it over and had it towed to the shop.... That's all I really know ;(

Needless to say I'm learning a lot about the AWD system and transimission on subarus now
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Old 05-12-2016, 01:37 PM   #10
AcquaCow
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Any time I've ever had slipping in higher gears, it has been the clutch.

Perhaps the clutch surfaces weren't cleaned all the way, or machined too much and now you don't have enough clamping force...

I've also received an incorrect pressure plate before and had slipping because of that.
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Old 05-12-2016, 03:32 PM   #11
ImprezaZRoss11
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So I took it to a Subaru specialist shop in Tacoma. They drove it and say it's gotta be the clutch. Specifically the flywheel being installed incorrectly. Resurfaced wrong, probably. Having the original shop put a new flywheel on it.
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