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Thread: 4l80E PROBLEMS. CONVERTER, CLUTCHES, LOCKUP? WHO KNOWS WHAT IT IS?

  1. #1
    Join Date
    Dec 2009
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    Corona, CA
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    4l80E PROBLEMS. CONVERTER, CLUTCHES, LOCKUP? WHO KNOWS WHAT IT IS?

    Just recently my truck does this wierd slipping jolting motion when you apply more than about a 1/4 throttle. It almost feels like it is in gear then it slips out of gear then back in. It is definately more noticeable in 1st gear from a dead stop. I haven't had the 80e in that long, maybe 500 miles on it. The truck feels way slower now. I don't know what the hell it is but it is frusterating as . Could it be the stock verter, clutches valve body going out? Also the trans has been leaking alot. I think it's coming from the front of the trans...could it be the pump? Yes I do check and fill the fluid regularly so I don't think the prob is from low fluid levels.
    Anybody know?
    Last edited by Moderator; 08-23-2011 at 09:11 AM.
    2007 GMT900 CCSB 5.3 VTS2300 Twin Screw Supercharger, Doug Thorley LT's, True 3" Duals into Dynomax Race Bullets, Nelson Tune, 4L80e w/transgo HD2-D, Truetrac, 4.10 r&p
    Need list: Stall, PLX 200 for my crappy AFR, X-pipe, GM 20's.

  2. #2
    Join Date
    Nov 2003
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    Denton Texas
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    20,689
    Tear it down and check it out. It may be a sticking pressure relief valve hanging open. Take it to a transmission shop and have them diagnose it.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  3. #3
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    Aug 2008
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    Tough to tell from that post. Someone here or at a trans shop needs to experience the issue.

  4. #4
    Join Date
    Jun 2011
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    Clarksville, TN
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    Quote Originally Posted by Chris092183 View Post
    Just recently my truck does this wierd slipping jolting motion when you apply more than about a 1/4 throttle. It almost feels like it is in gear then it slips out of gear then back in. It is definately more noticeable in 1st gear from a dead stop. I haven't had the 80e in that long, maybe 500 miles on it. The truck feels way slower now. I don't know what the hell it is but it is frusterating as . Could it be the stock verter, clutches valve body going out? Also the trans has been leaking alot. I think it's coming from the front of the trans...could it be the pump? Yes I do check and fill the fluid regularly so I don't think the prob is from low fluid levels.
    Anybody know?
    Could it be servo goin bad? Where doea the leak appearto be coming from? Front or rear of trans?

  5. #5
    Join Date
    Dec 2009
    Location
    Corona, CA
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    Ok, so i recently found out that you must use the longer fitting for the rear cooler lines in 97' and up 80e's. I did not initially install this fitting. I removed the 60e fitting and put the correct fitting in. My truck no longer does the jolting,slipping out of gear thing but my clutches and/or converter is/are definately burnt up. I was hoping the rear cooler line would fix all the probsbut due to the lack of fluid in the rear of the case I was reluctant that my internals would still be good. My truck still feels slow. Time for a rebuild.
    2007 GMT900 CCSB 5.3 VTS2300 Twin Screw Supercharger, Doug Thorley LT's, True 3" Duals into Dynomax Race Bullets, Nelson Tune, 4L80e w/transgo HD2-D, Truetrac, 4.10 r&p
    Need list: Stall, PLX 200 for my crappy AFR, X-pipe, GM 20's.

  6. #6
    Join Date
    Apr 2010
    Location
    Trussville, AL
    Posts
    240
    Quote Originally Posted by Chris092183 View Post
    Ok, so i recently found out that you must use the longer fitting for the rear cooler lines in 97' and up 80e's. I did not initially install this fitting. I removed the 60e fitting and put the correct fitting in. My truck no longer does the jolting,slipping out of gear thing but my clutches and/or converter is/are definately burnt up. I was hoping the rear cooler line would fix all the probsbut due to the lack of fluid in the rear of the case I was reluctant that my internals would still be good. My truck still feels slow. Time for a rebuild.
    uhhh yeah its definitely broken if you didnt use that!
    its just a turbo 5.3 that a couple of kids threw together

    01 silverado

    09 cobalt ss

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