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06-15-2024, 04:26 PM | #1 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,736
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Torque Converter clutch failures
When my 200k mile 4L60E went out a couple years ago I went ahead and put a rebuilt torque converter in it as well. The lockup clutch in that lasted maybe 10k miles and then failed. It was a big name rebuild company that I shouldn't have gone with to begin with, so I replaced it with a TC from the local company my trans rebuilder recommended. I also replaced the TCC solenoid with an OEM part for good measure.
Well, 20k later and I'm getting the same failure. It starts as the truck shuddering after going down the freeway 15min or so and encountering a slight uphill. Eventually it unlocks, stays that way for a few min, then locks back up like nothing happened. I know it'll get worse as time goes on until it won't lock up at all anymore. Besides confirming the trans is still getting a lockup signal when this happens, anything else I can check that might be causing this that's not a bad converter itself? My 98 GMC btw....
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
06-17-2024, 04:38 PM | #2 | |
Moderator
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,204
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Re: Torque Converter clutch failures
Quote:
Sure you can get a poorly built convertor, but for it to last 20,000 miles and then start giving issues tells me the convertor is the result of the situation, not the cause. When you replaced the previously failed convertor, was the transmission gone through again ? Or did you just replace the failed convertor and reinstall? Have you checked the power circuits responsible for the lockup process to apply? I am usually around to answer questions however, it may take me a day or so.
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox |
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06-17-2024, 06:27 PM | #3 |
Moderator
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,204
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Re: Torque Converter clutch failures
I just uploaded a diagnosis pdf for 4L60E transmissions....
See the post above yours for details. It is a working document and I will update as and when needed.
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox |
06-17-2024, 08:28 PM | #4 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,736
|
Re: Torque Converter clutch failures
Clinbarger rebuilt the trans. He posted a full review on here actually: http://67-72chevytrucks.com/vboard/s...d.php?t=812006
I spoke with him the first time this happened. He had tested the PWM solenoid and the tcc enable solenoid, but recommended replacing those before replacing the first torque convertor. I hadn't been happy with the balancing on that first TC along with the lockup problem so I did all 3 things at the same time, with oem solenoids.
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
06-18-2024, 06:32 AM | #5 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,566
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Re: Torque Converter clutch failures
My TCI Towing Converter Lost the lock up clutch. Tampa Converter cut it open on a lathe in front of me and said it looked just like a stock converter. It was one month old. I had a fella they recommended go thru my trans "Built by me" and he said he only found a couple problems. I had Tampa Converter Build me a custom converter and it has been fabulous for many years, This was a 700r4. Yeah yeah. 700rs get a bad wrap. This was built with a bunch of internal goodies. Has been behind my 406 pulling hard for decades.
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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