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stall converter slips when cruising

This is a discussion on stall converter slips when cruising within the Automatic Transmission forums, part of the Drivetrain category; its like the locking disc in the converter is junk it will slip when its locked but stomp it and ...

  1. #1
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    stall converter slips when cruising

    its like the locking disc in the converter is junk it will slip when its locked but stomp it and no slip just unlocks and lays you back. i have a aftermarket trans and a 3400 fuddle. dont know if its in the trans or the converter put them in at the same time at first it wasnt bad but has gotten worse over time

  2. #2
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    Have the transmission settings been modified in your tune?

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    Veteran 0rion's Avatar
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    can you describe what's going on a little better. To me it sounds like it's unlocking on it's own? Couple things will cause that....misfires and misfire counts in the pcm are a couple of the more common reasons.

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    Quote Originally Posted by pajeff02 View Post
    Have the transmission settings been modified in your tune?
    no the settings are the same as they were when i had the origanal trans with 3400 stall

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    I asked as I had issues when I upgraded my transmission -- the combo of the performance valve body and existing tune caused erratic lock up. Once the transmission settings in the tune were adjusted the problem went away.

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    Quote Originally Posted by 0rion View Post
    can you describe what's going on a little better. To me it sounds like it's unlocking on it's own? Couple things will cause that....misfires and misfire counts in the pcm are a couple of the more common reasons.
    sometimes it does unlock and i can tell when it does but usually if you just want to speed up just like 1 to 2 mph it revs about 200 to 400 rpm to much. it had a code on it last time i checked it was something like excessive rpm range i cant remember the number i'll have to pull it

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    i'll keep it in mind thanks for the help pajeff02

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    I guess "MISFIRE"
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