Question about Chevrolet Impala

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Hi I I have a new 4L80 full manual w transbrake in a street car w a 582 cui engine that has several issues from start and the US factory are not answering (I am a oversee customer, thanks), I have to think and do myself .1. forth gear is very soft engaging and. 2. lockup does only engage below 1000rpm and disengages at 1500 3. Heating problem, there is 220 degrees in rear of pan and only 140 to the cooler and 105 from cooler. There was a special rear case cooler fitting that is mounted but as there seems to be a internal bypass leak I'm thinking of that fitting may be wrong. Can somebody direct me about this , I need to get to the track this week and the trans seems to be ok in 1,2,3 gear so the heating problem is the problem I must fix Thanks Kent

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  • kent897 Aug 08, 2010

    Ok about the forth gear but how can it be so that the trans cooler not is getting same inlet temperature as in pan, TCI have diagrams of temperature and 260 degrees is not good for anything in the trans. About that the lockup does engage in that low pm only and the falls out so early, I thing it is a pressure problem ? I think that that pressure problem has a connection to the soft fourth gear ? / Kent



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There is usually an o-ring inside of those connectors. They also can crack if over tightened.

Is the filter new? Have you checked the fluid ports to make sure one isn't getting plugged up?

Posted on Aug 08, 2010

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Your heat is not excessive, and 4th gear is suppose to feel soft on engagement. 4th is more or less an overdrive and if you had a hard shift into it, it would really wear on the gears.

My temps usually go around 260-270 on my tranny and no problems for 3 years.

I wouldn't worry much about it.

Btw, I’m available to help over the phone in case u need at

Posted on Aug 08, 2010

  • Sean Wright
    Sean Wright Aug 08, 2010

    The temp reduces on its way to the cooler.

    lock up is suppose to be at low rpm, it needs to unlock at high rpm and drop to 3rd gear...4th is only an overdrive for low load operation.



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