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Old 05-16-2013, 11:37 AM   #26
Al C.
 
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This sums it up..


There is a downside to adding too much friction modifier. The diff clutch plates are what give the diff its limited slip ability. They are designed to grip to each other and pass torque to the tire with grip when one tire looses grip. When your fluid properties are not correct (too slippery), these clutch plates lose their friction with each other, thus the diff becomes more like an open diff.

While that might not be as much as factor on the street, you should at least recognize that adding too much modifier, while it won't hurt the diff, does cost you performance. The goal is to just have enough additive to prevent chatter and no more.
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Old 05-16-2013, 12:13 PM   #27
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Quote:
Originally Posted by Al C. View Post
This sums it up..


There is a downside to adding too much friction modifier. The diff clutch plates are what give the diff its limited slip ability. They are designed to grip to each other and pass torque to the tire with grip when one tire looses grip. When your fluid properties are not correct (too slippery), these clutch plates lose their friction with each other, thus the diff becomes more like an open diff.

While that might not be as much as factor on the street, you should at least recognize that adding too much modifier, while it won't hurt the diff, does cost you performance. The goal is to just have enough additive to prevent chatter and no more.
OK, stupid question....

Does the friction modifier increase or reduce the friction of the clutch plates?
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Old 05-16-2013, 01:03 PM   #28
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Adding the modifier reduces friction, less friction to the plates reduces torque to the wheels there for "less" power. if you want to increase friction you add less modifier but then you get "stick slip" or chatter. So the modifier is just that, it's used to modify the coefficiency of the diff fluid to suite you application.
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Old 05-30-2013, 12:56 AM   #29
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My car has the same noises.
The question to me is it a problem long term?
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Old 05-30-2013, 09:57 AM   #30
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Have you changed the diff fluid with the recommended GM synthetic? I wouldn't want to drive it long term that way if a simple fluid change with the proper fluid is all that is required to fix it. I purchased the GM fluid and had a quick lube place change it on my car around 1000 miles.
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Old 05-30-2013, 11:08 AM   #31
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Very common problem discussed on the Corvette forum. I thought the fix over there was changing out the fluid using Royal Purple (Preferred).
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Old 05-30-2013, 05:49 PM   #32
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My car has the same noises.
The question to me is it a problem long term?
Bowtie724 and Brownster,

Sincere apologies to hear about the concern. Please let me know if a GM diagnosis is needed in this situation. I would be more than happy to schedule an appointment. Feel free to PM me and reference this thread if I can be of assistance.

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Old 06-05-2013, 05:23 PM   #33
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Had service appt today they followed TSB issued about a month ago involving fluid flush and figure 8 driving. Don't hear noise now but will check when cold to make sure it is fixed.
When I left dealer I drove about 2 miles to a store.When I went to restart the car It was running very rough.Dic said reduced power and 3 lights on plus check engine light.I turned off and restarted 3 times to no avail.I live about 75 miles away from the dealer so luckily I was close when it happened.I limped back to the dealer... car would barely pull itself.
The tech said the code was 06 dont remember the rest.He reflashed the ecm with update reguarding fuel regulator I think.Drove home so far so good.
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Old 06-05-2013, 06:28 PM   #34
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Had service appt today they followed TSB issued about a month ago involving fluid flush and figure 8 driving. Don't hear noise now but will check when cold to make sure it is fixed.
When I left dealer I drove about 2 miles to a store.When I went to restart the car It was running very rough.Dic said reduced power and 3 lights on plus check engine light.I turned off and restarted 3 times to no avail.I live about 75 miles away from the dealer so luckily I was close when it happened.I limped back to the dealer... car would barely pull itself.
The tech said the code was 06 dont remember the rest.He reflashed the ecm with update reguarding fuel regulator I think.Drove home so far so good.
Awesome news,

Thanks for the update! Feel free to inform us of when you may be experiencing a concern moving forward. We wish you all the best.

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Old 06-05-2013, 07:03 PM   #35
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I do need to give a to William R and all the great Hampton Chevrolet team for their exemplary service today!
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Old 06-06-2013, 10:23 AM   #36
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Had service appt today they followed TSB issued about a month ago involving fluid flush and figure 8 driving. Don't hear noise now but will check when cold to make sure it is fixed.
When I left dealer I drove about 2 miles to a store.When I went to restart the car It was running very rough.Dic said reduced power and 3 lights on plus check engine light.I turned off and restarted 3 times to no avail.I live about 75 miles away from the dealer so luckily I was close when it happened.I limped back to the dealer... car would barely pull itself.
The tech said the code was 06 dont remember the rest.He reflashed the ecm with update reguarding fuel regulator I think.Drove home so far so good.

Do you have the TSB, a lot of people would like to see it.
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Old 06-06-2013, 04:47 PM   #37
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Sorry,they not give me that info.
Service tech drained an refilled twice with figure 8's and 20 mile rides inbetween.Asked him if he added anything to the fluid and he said no but fluid smelled to him like friction modifier was already in it.
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Old 06-06-2013, 04:51 PM   #38
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Sorry,they not give me that info.
Service tech drained an refilled twice with figure 8's and 20 mile rides inbetween.Asked him if he added anything to the fluid and he said no but fluid smelled to him like friction modifier was already in it.
They did that to mine also but the only TSB they had for camaro rearend exempted the ZL1.
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