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90 964 manual trans slipping issue

This question might sound stupid . I have worked on 911's for years . I have never been inside a 964 manual trans . I have spent some time trying to find info on this before trying here .

1990 964 manual trans .

When I got to it , it was partially apart so I could not drive it . The boss said he drove it and the clutch would slip in high gear under hard load .


I pulled the motor/trans , split the trans from the motor , pulled the clutch and it shows almost no wear .
It is not even close to the rivets . The pressure plate fingers are even , the flywheel and pressure plate show age but no signs of slippage (hot spots ect.)

I read that this trans does a power split between between the front diff and the rear cv shafts .

Does this trans have a viscous coupler or any other system that would allow it to sound like it is slipping ?

I await the replies .

Brian
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Old 12-18-2017, 12:15 PM
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Quote:
Originally Posted by wrenchhead944 View Post
This question might sound stupid . I have worked on 911's for years . I have never been inside a 964 manual trans . I have spent some time trying to find info on this before trying here .

1990 964 manual trans .

When I got to it , it was partially apart so I could not drive it . The boss said he drove it and the clutch would slip in high gear under hard load .


I pulled the motor/trans , split the trans from the motor , pulled the clutch and it shows almost no wear .
It is not even close to the rivets . The pressure plate fingers are even , the flywheel and pressure plate show age but no signs of slippage (hot spots ect.)

I read that this trans does a power split between between the front diff and the rear cv shafts .

Does this trans have a viscous coupler or any other system that would allow it to sound like it is slipping ?

I await the replies .

Brian
There were 2 version of 964
rear wheel drive uses g50.xx
all wheel drive uses g64.xx
the transmissions used in each are very different

if you had an all wheel drive trans in front of you the answers to your questions would be immediately would be immediately obvious

Look at the nose, this is a g50.xx, no output shaft for the front axle, the shoft near the bottom is the shifter which is the same in both g50 & g64


this is a g64.xx w/ output shaft for the front axle


Behind the cover of a g64, output differential which is computer controlled to vary the torque split, and shift shaft

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Old 12-23-2017, 09:07 AM
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This is what I wanted to know .
Different sites , different answers .
It is a awd . So there is a viscous coupler behind the cover.
I have seen Land Rovers with bad viscous couplers that slip under hard load .
I bet that is what this one has done .
One more piece of the puzzler solved or at least an avenue to pursue .
Thanks for the reply

Brian
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Old 12-23-2017, 02:13 PM
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Quote:
Originally Posted by wrenchhead944 View Post
This is what I wanted to know .
Different sites , different answers .
It is a awd . So there is a viscous coupler behind the cover.
I have seen Land Rovers with bad viscous couplers that slip under hard load .
I bet that is what this one has done .
One more piece of the puzzler solved or at least an avenue to pursue .
Thanks for the reply

Brian
One of the more likely failure points on the 964 g64 is the hyd slave cylinders that actuate the clutch packs in the diffs, there is a lateral and longitudinal diff, both clutch type. Another failure point is the lateral and longitudinal accelerometers that provide the info to control the hyd circuits that control the diff activity

Her'e one disassembled, the seals are what fail most often
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Old 12-23-2017, 02:43 PM
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I did notice some corrosion / minor leakage when I pulled the slaves .
I was going to service them .
Are those o rings available ?
If so any particular source and part number ?
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Old 12-23-2017, 03:03 PM
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Quote:
Originally Posted by wrenchhead944 View Post
I did notice some corrosion / minor leakage when I pulled the slaves .
I was going to service them .
Are those o rings available ?
If so any particular source and part number ?
I don't believe that the o rings are generally available, Porsche will want to sell the slave cylinder, but I vaguely recall that maybe '9 Meister' in England came up w/ something that works
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Old 12-24-2017, 04:57 AM
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BTW, be sitting when you price these parts,

here are some #s a researched maybe 10yrs ago
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Old 12-24-2017, 05:02 AM
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Thanks for the info .
I will pass it along .
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Old 12-24-2017, 01:02 PM
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