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4L60E trans slipping? going bad

This is a discussion on 4L60E trans slipping? going bad within the General Help forums, part of the LSx Technical Help Section category; since the cam and tune, the car jerks from Parking to Drive cause of stock Stall, and on WOT it ...

  1. #1
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    4L60E trans slipping? going bad

    since the cam and tune, the car jerks from Parking to Drive cause of stock Stall, and on WOT it goes to 5k then revs to 6500 rpm then back, acting like its not shifting. someone told me that i added some much power on a stock 60,000 mile 4L60e and those transmission cant handle that power, sp it will started to slip and over heat. whats wrong with it.

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    Member flybird's Avatar
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    Mid Night Blue
    1999 Firebird 3.8 series

    If im not right correct me, but our tranny's can withstand 400hp.. Or is it 500hp.. Idr but it can withstand some pretty mean power..

    Are you sure you got it tuned right???

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    Member flybird's Avatar
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    Mid Night Blue
    1999 Firebird 3.8 series

    Btw you have 2 post of this. Lol

    Also these trannys are also used in ls1 & ls2 gto cars so you know they can take power.
    Last edited by flybird; 03-06-2012 at 10:16 PM.

  4. #4
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    he didnt tune the trans, i have a 228R cam, Headers, Y Pipe, SLP Ram Air Intake, Lid, Tune, 377rwhp 384rwtq. and Trans is jerking alot more, and doesnt shift correct on WOT in OD

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    Member flybird's Avatar
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    Mid Night Blue
    1999 Firebird 3.8 series

    Well if you have a cam, headers, ect. You def need a proper tune. Your okay on HP rate.

    1) check fluid(make sure its not burnt & do it in park and running.)

    2) maybe change that old tranny filter

    3) any vibrations at all?

    4) the jerking from park to drive is actually sorta normal, alot of ppl who have a automatic experience this as well, I dont bc I own a v6

    5) torque convertor or flywheel could be bad.

    Main thing id check, since you just got a cam, I would go back and have them retune the car. Just to make sure..

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    i have they tune it twice, cause the TPS sensor the 1st time. and its has a delayed on shifting, like its shifting at 2500rpm not 1900 like always. and i get the jerking cause the cam and stock stall

  7. #7
    Member flybird's Avatar
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    Mid Night Blue
    1999 Firebird 3.8 series

    If you get mods then I would think you'd be pushing higher rpm's.. Idk for sure though.

    you said a delay?? Thats all in the computer. I have a slight delay on shifting as well. When I got a chip for my car, it changed the delay shifting.

    is there any vibrations coming from the car? And did you check fluid?

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    that car was fine, until i took the TPS sensor out and clean it off, then started going to 5,000 rpm and will not upshift

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    Member flybird's Avatar
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    Mid Night Blue
    1999 Firebird 3.8 series

    Well seems like u found your answer...

    Worse case senario.... Need a rebuild tranny.

  10. #10
    Member flybird's Avatar
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    Mid Night Blue
    1999 Firebird 3.8 series

    Test the sensor..

    Mesure the ohms, makes sure the numbers are smoot as you increase the resistance.

  11. #11
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    Our cars are actually near the top of the 4L60E's capability and a transmission upgrade once the power has been increased is not a bad idea. The stock programming includes torque management which is designed to make the transmission last -- it may have been deleted by your tuner as this is a common change. This being said, it does sound like messing with the TPS sensor may be the issue. Do you have a scanner so that you can verify that the TPS output matches the actual throttle setting?

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    Sounds like the trany lost it's programing.

    Happened to my H3 (has the AWD version of the 4l60e) and it acted exactly like described by the OP.

    With that said, IMHO the the 4l60e is'nt a very good unit, 3800's eat them often with a lousy 200hp..

    It's derived from the 700r4 which was another junk unit that could easily be eaten by a little 135hp 2.8l v6..lol

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