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Bulit ls1 can't keep a 4l60 in it help me!

This is a discussion on Bulit ls1 can't keep a 4l60 in it help me! within the Drivetrain forums, part of the LSx Technical Help Section category; I have a 99 trans am ws6 and i can not keep a 4l60 in it, i blew 4 trannys ...

  1. #1
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    drak blue
    1999 trans am

    Bulit ls1 can't keep a 4l60 in it help me!

    I have a 99 trans am ws6 and i can not keep a 4l60 in it, i blew 4 trannys then had one built and that lasted 500 miles. So should i go with a turbo 400 or a 4l80 let me know what you guys think.

  2. #2
    Bone it like you own it FORD RECOVERY EXPERT's Avatar
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    Black / Stryker Blue
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    Read this.


    Now, on topic...


    Did you change the lines and the radiator????

    That many shelled tranny's, ( I had an 02 Z71 p/u w/ a 4l60, and it had 7 trans before 30k) Leads me to believe that when the firstone burnt up, it plugged the cooler, and now they are overheating, ( which is what happened to mine).
    Last edited by FORD RECOVERY EXPERT; 06-21-2009 at 10:37 AM.

  3. #3
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    You should be able to get a 4L60e to hold up, but both the THM400 and the 4L80 are great choices.
    edit BTW what keeps failing in your transmissions??
    Last edited by Cutlass; 06-21-2009 at 05:54 PM.

  4. #4
    The Bandit Wesman's Avatar
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    As mentioned, did you flush or replace the trans cooler?? That is critical whenever you change a trans, if you haven't done so, thats the reason for your failures.

  5. #5
    Veteran Hi-Po's Avatar
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    Yes, why so many failures?

  6. #6
    Impounded
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    What part of the transmission was breaking?

  7. #7
    Senior Member JaycenK's Avatar
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    Are you breaking sun shells?
    I see in your name you are running 450rwhp. there is no reason you should be going through 4L60E's like that unless...
    A. they are rebuilt to stock or
    B. you have one hell of a big kit of NOS on that thing with stickies above and beyond 450rwhp.

  8. #8
    Junior Member johno's Avatar
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    put a 6sp in it

  9. #9
    In need of another LS1 00blacktransam112's Avatar
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    Quote Originally Posted by johno View Post
    put a 6sp in it
    +1
    6 speed

  10. #10
    James Bond Spikito's Avatar
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    have your Torque converter checked, sometimes it will get cracks in it on the first break. Im not sure how but this can cause the new tranny to break as well.

    another culprit could be alignment, With 450whp im sure your frame isnt the straightest thing in the world unless you seriously beefed it up early on. If the back end it off a little, it can put pressure on the drive train causing excessive heat and wear.

  11. #11
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
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    I don't think this guy is coming back to check on his answers. ??

  12. #12
    James Bond Spikito's Avatar
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    2001 3.8 Black - sold
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    Maybe he doesnt realize just how fast this forum tends to be

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