Torque Converter Clutch Failure
Thread Starter
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Posting Guru
Joined: Aug 2007
Posts: 1,714
Likes: 1
From: Canton, IL
Torque Converter Clutch Failure
This has gone on long enough..
So I get the trans back together, shifting great. except.....
TC clutch goes out in three days. (150 miles). What could i have done that would have caused that? Pump, TCC control valve, Line pressure Reg? Sticking valve in pump? It had noise from installation day, but worked fine. (and I didn't beat on it. I was rather gingerly with it, to be honest..)
Yes the magnet in the pan was coated... yes there was metal flake, but no chunks.
No slipping, and shifting was fine, nothing wrong with the trans now.
I have pulled the trans again, the pump bushing is ate up, (grooves and scratched to hell)..
After it failed, the normal TC functions worked fine, just no lockup.
The converter is on it's way back to TORCO for a warranty replacement.
So I get the trans back together, shifting great. except.....
TC clutch goes out in three days. (150 miles). What could i have done that would have caused that? Pump, TCC control valve, Line pressure Reg? Sticking valve in pump? It had noise from installation day, but worked fine. (and I didn't beat on it. I was rather gingerly with it, to be honest..)
Yes the magnet in the pan was coated... yes there was metal flake, but no chunks.
No slipping, and shifting was fine, nothing wrong with the trans now.
I have pulled the trans again, the pump bushing is ate up, (grooves and scratched to hell)..
After it failed, the normal TC functions worked fine, just no lockup.
The converter is on it's way back to TORCO for a warranty replacement.
Lead Driver
Joined: Nov 2008
Posts: 8,450
Likes: 70
From: South Jersey
Just a bad convertor happens all the time, buddy just had a built trans put in in 99 Dodge Cummings. Six days later TQ just blew! The shop is doing a complete rebuild again for free of course and they gave him a little S10 to drive for work
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Thread Starter
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Posting Guru
Joined: Aug 2007
Posts: 1,714
Likes: 1
From: Canton, IL
I get it that it probably was just a bad converter, but... what would cause a TC clutch to eat itself in 150 miles (mostly highway at that) that would be external to the TC itself?
Lead Driver
Joined: Nov 2008
Posts: 8,450
Likes: 70
From: South Jersey
Convertor eat themselves from a lot of reason, could of had bad braces on the fines or something wrong with a clutch inside. Hard to say...hopefully you get everything fixed for free
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iPhone from IB AutoGroup
Thread Starter
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Posting Guru
Joined: Aug 2007
Posts: 1,714
Likes: 1
From: Canton, IL
Ya.... no, not for free.. I rebuilt the trans, on my dime.. and time... I've cleaned it all out, checked all the bushings, Have to go have a new pump bushing pushed. Changed the filter, cleaned the VB's out. If it fails again, I'll get another seal kit and change all those again.. Luckily, seems like all the converter did was eat the clutches in itself. Never did overheat. fluid looks ok, but another 60 in new fluid will go in. TC on its way back to the manufacturer for warranty replacement.
Fleet Mechanic
Joined: Nov 2011
Posts: 1,825
Likes: 43
From: Land of Taxes
Ill assume you replaced the converter on the re-build if its going back to someone? I have seen this happen to new converters and to the uninformed who put a used converter back in after a rebuild.
I have a shop here that will cut them open rebuild and re-weld for cheap. Never had a problem with these. I have had bad units out of the box. Sux cuz it blows debris through a new trans!
You prob already know this... do a full flush on the whole system to extract as much of the clutch material as possible. Follow it with another full flush in about 1K miles...but you likely knew that too. Yeay 2 flushes at $7/qt and two filters.
I have a shop here that will cut them open rebuild and re-weld for cheap. Never had a problem with these. I have had bad units out of the box. Sux cuz it blows debris through a new trans!
You prob already know this... do a full flush on the whole system to extract as much of the clutch material as possible. Follow it with another full flush in about 1K miles...but you likely knew that too. Yeay 2 flushes at $7/qt and two filters.
Thread Starter
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Posting Guru
Joined: Aug 2007
Posts: 1,714
Likes: 1
From: Canton, IL
yup, replaced the original TC with a new rebuilt one, that one failed, now sent in the new rebuilt one for warranty replacement.. I've already swapped the fluid twice, this will be the third time.
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Fleet Mechanic
Joined: Nov 2011
Posts: 1,825
Likes: 43
From: Land of Taxes
Your havin wayyyy tooo much fun. 
. With luck the magnet and filter caught all of it except for the nano sized pieces!
. With luck the magnet and filter caught all of it except for the nano sized pieces!
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