Gen 3 Torque Converter
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
Gen 3 Torque Converter
Just got a call from my local chevy dealer that my 2015 base A8 Stingray needs a new torque converter to correct the V4 shudder at 1450RPM.
I have read somewhere on the Forum that others have wrestled with this and discovered that GM has a new design "Gen 3" torque converter that solves the v4 shudder problem. I cannot find it now that I need it using search.
Apparently I must clearly specify that I want this Gen 3 or the dealer will order a TC from the regional warehouse which is likely to be a Gen 2 from those on the shelf.
Can anyone help me with a part number or other spec so that I can direct my service rep in the right direction?
Thanks,
Will
I have read somewhere on the Forum that others have wrestled with this and discovered that GM has a new design "Gen 3" torque converter that solves the v4 shudder problem. I cannot find it now that I need it using search.
Apparently I must clearly specify that I want this Gen 3 or the dealer will order a TC from the regional warehouse which is likely to be a Gen 2 from those on the shelf.
Can anyone help me with a part number or other spec so that I can direct my service rep in the right direction?
Thanks,
Will
Last edited by flynhi; Apr 25, 2018 at 10:32 AM. Reason: grammar
Drifting
Joined: May 2013
Posts: 1,972
Likes: 1,098
From: Texas Hill Country Texas
OP; read Tadge’s response in the Ask Tadge section. He says that the only difference in TC part numbers is to accomodate small manufacturing changes and the actual operational design hasn’t changed.
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
Thanks very much!
Will
Race Director
Joined: Oct 2008
Posts: 16,671
Likes: 7,738
From: NJ
jeff strausser Corvette Engineer at Carlisle this year stated that it was a Fluid viscosity change. not the converter. the converters are an issue using the older fluid. maybe someone can check if the fluid part number has changed? maybe converters with too much damage have to be changed, too far gone too just flush and install new fluid??
Burning Brakes
Joined: May 2016
Posts: 894
Likes: 667
St. Jude Donor '17
16/C7Z,
Your info gels well with my experience. Because of this forum, I detected mine when it was only a wavering rpm needle. The shudder never developed and the triple flush fixed the rpm needle. They put a different fluid in, and that fixed everything. So I’d agree, it was the fluid that changed, not the converter. Your mileage may vary.
Your info gels well with my experience. Because of this forum, I detected mine when it was only a wavering rpm needle. The shudder never developed and the triple flush fixed the rpm needle. They put a different fluid in, and that fixed everything. So I’d agree, it was the fluid that changed, not the converter. Your mileage may vary.
Last edited by Luke42_02; Apr 26, 2018 at 01:45 AM.
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
More info on C7 A8 torque converters
While my Stingray is in for trans service to deal with the V4 shudder, I got a chance to visit with the GM tech who is working on my car.
He is the designated Corvette specialists at Autonation Chevrolet in Austin and has sen this issue quite a few times. He says that the problem is endemic in C7s' built before Nov 2015 (mine was early production - Oct 2014. Apparently the vendor who manufacturers the torque converters was using a solvent to final clean the innards that was combining with ATF and corroding the interior of the TC. This solvent process was discovered and stopped in the fall of 2015. So, somewhere out there the tech says is a TSB to replace the TC in all A8s manufactured before that date.
So, thanks again to John, I am now getting the correct Gen 3 TC filled with the correct Mobil 1 ATF fully covered by warranty.
We also discussed the typical 1-2 hard shift when the A8 is cold as in an overnight park in the garage. Mine does this big time.
There is a post somewhere on the Forum about the installation of a check valve to prevent the TC from draining down overnight. The tech has the same problem in his Chevy pickup with an A8. So, the theory is that the overnight drain back causes the TC to be less than full with ATF at start up which causes the hard shift until there has been enough run time to fill the TC.
Any input from Forum members such as a POP or TSB would be greatly appreciated.
More to come....
Will
He is the designated Corvette specialists at Autonation Chevrolet in Austin and has sen this issue quite a few times. He says that the problem is endemic in C7s' built before Nov 2015 (mine was early production - Oct 2014. Apparently the vendor who manufacturers the torque converters was using a solvent to final clean the innards that was combining with ATF and corroding the interior of the TC. This solvent process was discovered and stopped in the fall of 2015. So, somewhere out there the tech says is a TSB to replace the TC in all A8s manufactured before that date.
So, thanks again to John, I am now getting the correct Gen 3 TC filled with the correct Mobil 1 ATF fully covered by warranty.
We also discussed the typical 1-2 hard shift when the A8 is cold as in an overnight park in the garage. Mine does this big time.
There is a post somewhere on the Forum about the installation of a check valve to prevent the TC from draining down overnight. The tech has the same problem in his Chevy pickup with an A8. So, the theory is that the overnight drain back causes the TC to be less than full with ATF at start up which causes the hard shift until there has been enough run time to fill the TC.
Any input from Forum members such as a POP or TSB would be greatly appreciated.
More to come....
Will
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Verdad Gallardo
Team Owner
Joined: Sep 2005
Posts: 20,352
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From: Ventura County, Calif
There is a post somewhere on the Forum about the installation of a check valve to prevent the TC from draining down overnight. The tech has the same problem in his Chevy pickup with an A8. So, the theory is that the overnight drain back causes the TC to be less than full with ATF at start up which causes the hard shift until there has been enough run time to fill the TC.
Any input from Forum members such as a POP or TSB would be greatly appreciated.
More to come....
Will
Any input from Forum members such as a POP or TSB would be greatly appreciated.
More to come....
Will
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