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7th Gen Drivetrain Transmissions, clutches, and axles.

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Old 08-05-2011, 11:15 AM   #1 (permalink)
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transmission issues. 04ls

This issue has been going on for a while now. Sometimes** the car when driving will shift hard. & it sounds bad. & when shifting to 2nd is just a jerk. But 2nd to 3rd gives a bad loud thump. & to 4th not so bad. & this will keep happening if driving until I turn the car off. Then it stops? I don't get why this is happening. & sometimes the rpms will sky rocket & it won't shift then out of no where that loud thump noise. I still have the warranty, just everytime I try to show someone it doesn't do it-__- please help me solve this problem. Thanks.

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Old 08-05-2011, 11:17 AM   #2 (permalink)
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& what I mean when I turn the car off I mean if I turn it off for a few minutes & start it back up it doesn't do it anymore.

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Old 08-05-2011, 11:51 AM   #3 (permalink)
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What condition is the fluid in? If its brownish and/or smells burned then change it and the filter would be a good starting point.

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Old 08-05-2011, 12:10 PM   #4 (permalink)
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I just had the filter changed & flushed about 20k back

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Old 08-05-2011, 12:54 PM   #5 (permalink)
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Well beyond that, if it is the transmission (sounds like it is but unsure), its either on its last leg or needs diagnosed w/ a really fancy scanner and probably needs to be taken in to a shop. Unless you wanna gamble and replace the "control solinoids" which are common problems w/ gm trans.

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Old 08-05-2011, 01:30 PM   #6 (permalink)
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Yeah I'm not sure. Just what I don't get is why it does it until I restart my car then its fine. Just doesn't make sense to me. But I mean my tranny gauranteed for about 50 more k.

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Old 08-05-2011, 01:32 PM   #7 (permalink)
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warranty wise lol

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Old 09-14-2011, 02:47 PM   #8 (permalink)
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Mine is doing the same exact thing! Hasn't done it for about a month until today in the rain. Drove about 20 miles. Do you remember what the weather was like when it was shifting hard? I think mine has only done this when it's wet out. Wondering if trans being wet has any effect on why it's shifting hard.

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