Does the Torque Converter Engage Twice? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-23-2005, 11:09 PM   #1
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Default Does the Torque Converter Engage Twice?

At speeds below 55mph under light throttle my TC seems to engage twice. Say i'm driving 45mph w/o TC locup running 1800 rpm. At that time the TC "begines" to lockup. It wil drop to 1500 rpm quick, hold for a split second, then drop to the normal 1300 or so rpm. It feels like normal lockup, just in the middle of locking up it "lags". Is that the torque management doing its job or what? Is it nomal or not?
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Old 05-23-2005, 11:22 PM   #2
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Sounds like 4th, then lockup. Normal.
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Old 05-23-2005, 11:25 PM   #3
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sounds normal to me. the 65E series of transmissions has a variable torque converter. It isn't always either locked or unlocked. It can be kind of "inbetween." Right?
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Old 05-23-2005, 11:26 PM   #4
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i noticed back when my aunt had her grand prix 3 years ago her car went from 3rd to 4th gear really fast then to TC. All around 37-40 mph. is that what your talking about? and under normal driving conditons?
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Old 05-23-2005, 11:27 PM   #5
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I forgot, 3rd gear has lockup too. I'm prolly confusing 3rd gear lockup with the 4th gear shift.
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Old 05-23-2005, 11:39 PM   #6
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Like others have said. It'* all probably happening right around the same time.
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Old 05-24-2005, 05:07 PM   #7
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Ok... This sounds normal..

The 65-E is a diffrent animal as compared to the 60-E...

The 45-E and 65-E are simmilar in the way they are controled... The TC in these transmissions is designed to be able to slip to a certain degree to allow the engine to spin fewer revs say in town tooling around without being fully locked up... The clutch material in the TC is designed to be able to tollerate the extra slip thats allowed... So it is variable...

It seems that the 45-E and 65-E can go into OD or 4th gear early on with the lock up clutch engaged... This promotes better fuel effiency...

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Old 05-24-2005, 10:37 PM   #8
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Thanks. Great info jr's3800.! Glad to know minor slip is normal. The engine does "flair" 50rpm right before lockup. It wouldn't even be noticable to an average driver.
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Old 05-24-2005, 10:51 PM   #9
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Quote:
Originally Posted by fantastic88
Thanks. Great info jr's3800.! Glad to know minor slip is normal. The engine does "flair" 50rpm right before lockup. It wouldn't even be noticable to an average driver.
I pay close attention to the tach in any car i drive... I noticed that all of the 4T45-E'* and 4T65-E'* all do this...

The 60-E just goes into lockup nice and easy... But will not do this at a low road speed... I'll bet if the 60-E could do this the fuel effiency around town would be higher...



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