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Old 07-18-2003, 12:08 PM   #1
MaddMax
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Member#: 9264
Join Date: Aug 2001
Location: Kansas City
Vehicle:
2012 WRX 5dr
Ice Silver

Default AWD rear differential binding (98 GT Legacy)

Seeing that much of what's on my wife's 98 Legecy GT wagon is shared with the Imprezza, I figured you guys might know the answer. About 2 years ago we purchased a used 98 Legacy GT wagon automatic from a Subaru dealer in Kansas City. Upon the test drive, I noticed that there seemed to be some studdering and rocking that came from the rear of the car upon tight low speed manuvers (figure 8s). Upon searching I found out that most likely the rear differential clutch pack was experiencing a bind. I told the dealer I'd buy the car if they fixed the problem. They fixed the bind, but now the problem is back. It's annoying to me, but the wife has gotten use to it and figured it was normal. Does anyone else have this problem? If so, is it common and is there a TSB for it. Unforunately I'm out warranty range for the car and work that was performed (1yr/12K mile).


Dave
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Old 07-18-2003, 03:51 PM   #2
SubyTechMaster
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The source of your problem is most likely the MPT clutch at the rear of the A/T. The dealer should have been able to diagnose this in the 1st place and it may be too late for you to get them to stand behind it. Take it to another Subaru dealer for diagnosis. This could also be caused by uneven tire sizes on the car, the tires MUST be within 1/4" circumferance of each other. If they are not the same size it will overwork the Diff. and cause damage to the A/T.
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Old 07-18-2003, 03:56 PM   #3
MaddMax
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The tires are the same size and make so there's not a problem there.

This MPT clutch, it's located in the tranny or is it in the differential? In your opinion, if this a serious issue and is it an expensive fix. Your help is greatly appreciated.


Dave
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Old 07-18-2003, 05:52 PM   #4
SubyTechMaster
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Quote:
the tires MUST be within 1/4" circumferance of each other.
This has nothing to do with make of tire or the size on the sidewall, you need to physically measure the tires. As an alternative, yo can position the car on a flat surface and mark the tires with chalk at he same point and roll the car straight forward or backward several revolutions, all the marks should stay at the same place.
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Old 07-19-2003, 04:10 PM   #5
Hondaslayer
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Also just because it has matching tyres now does not mean it always did.........
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Old 07-20-2003, 12:24 AM   #6
MaddMax
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Ice Silver

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The tires measure with 1/8" of each other when using a level and measuring stick. It must be the MPT clutch. According to sales slip that was in the car when I bought it, the orginal tires were replaced one month prior to me buying it.

I searched the internet and found many references to the rear differential "bind" with the 4EAT of which there is a Subaru tech bulletin. According to a Subaru memo it says to measure the tires and make sure they're within a 1/4" before fixing anything. To bad they don't mention what the other problem could be.

My main question is will this annoying problem become a severe problem?

Today, I changed out the front and rear diff fluids along with a tranny fluid drain. I noticed that there are numerous very very slow leaks (dirty grimmy reside, nothing wet) around the front axles and front diff housing and also a slow leak at the tranny pan gasket and potentially something on the upper right side of the tranny (sender unit/servo or something). Nothing is severe, but I'm a bit taken away at all the leaks on a Japanese vehicle. Looking up under there made me think of my old 94 Z28 or my father's 96 Tahoe (both "leakers").



Dave

Last edited by MaddMax; 07-20-2003 at 12:30 AM.
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