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Old 03-28-2009, 02:18 PM
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4l60E slipping in OD

I have a 99 camaro with a 4L60 and is slipping at highway speeds under light ecceleration, until you let off and then eccelerate hard, after that it wont slip for a while. It never slips under hard ecceleration. does anybody have any idea what might be going on?
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Old 03-30-2009, 02:53 PM
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could be many problems:


Too much band clearance,

accumilator bore damaged, piston pin hole worn out,

Cut lip seals,

mis assembled 2-4 servo pistons,

low pressure in OD, worn boost valve circuit

solenoid is weak , does not hold pressure for shift valve to O-drive
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Old 03-30-2009, 06:38 PM
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what are you feeling? flare? lost speed? is it while the tcc is engaged?
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Old 04-01-2009, 05:44 PM
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Not sure what tcc means, but not really a loss of speed, more of an increase of rpm, but os soon as i let off of the gas and get back into it hard it does fine, and i can continue at highway speed and and it wont slip for a while until i start to play with the accellerator again by lightly accelerating and letting off. mind you this happins between 60 and 75 mph. will just cruzing.
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Old 04-01-2009, 06:55 PM
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tcc stands for torque converter clutch. depending on throtle position, you may be experiencing the tcc disengaging. but assuming that you have owned this vehicle for a while, this is a new condition. best guess at this time would be a tcc issue. mil on?

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Old 04-01-2009, 06:58 PM
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LEE EYES:

it is best to post the response in English , not the letters for parts and stuff in the transmission. These guys for the most part do not know what you mean.
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Old 04-01-2009, 07:05 PM
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sorry... i forget sometimes. mil is the check engine light. is it on?
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Old 04-02-2009, 10:26 AM
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No i have not had the light come on yet, I had thought that these trans no longer had lockup converters, but if they do that makes a lot of sense, although when this condition happens the rpm's have reached as high as 4500 which led me to believe that it was some sort of clutch slippage.
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Old 04-02-2009, 12:41 PM
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yeah. torque converter clutch will only change a few hundred rpm... sounds like a pressure or seal issue. check tranny fluid?
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Old 04-02-2009, 04:37 PM
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Thanks, the guys at aamco said about the same thing after i had taken him for a drive to replicate the problem, they had it for two days and could not repliacate it themselves , I appreciate all the input, I am fairly good with mechanicals, and fuel injection, but when it comes to automatics i get a little lost. but again thanks so much.
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Old 04-02-2009, 10:52 PM
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i understand. i still have trouble, even after two years of training. there is always room to expand your knowlage base!
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