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Thread: trans slipping ?

  1. #1
    Junior Member ytry's Avatar
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    Apr 2006
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    33

    Default trans slipping ?

    Ok guys here is a good one, I have a aftermarket trans from mad dog transmission 4L80e. I was spinning the tires going in circles (cookies) and done 3. then got on the road and headed home and i hear a clunk and it felt as if something was dragging. I thought maybe i had hit the line lock. But not that. Now My trans seems to slip when getting on it . Is there a pid I can scan to see what is going on? I noticed that when shifting into 2nd and 3rd it is sloppy and slushy.. that has been going on for about a week.. it used to shift firm in all gears and now the 1st to 2nd is good but all the others are sloppy.. any info you can give me would be helpful.
    1999 Pontiac Trans-am: LS2 402, Free mods,Line lock, Nittos,Auburn 3.73's,EFI live tune, slp lid, All 3" exhaust with Magnaflow,

  2. #2
    Joe (Moderator) joecar's Avatar
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    Apr 2003
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    28,403

    Default

    4L80E has input (after TC) and output (after geartrain) speed sensors:
    GM.TIS
    GM.TOS

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