Flex plate to Torque converter clearance

Discussion in 'The "Juice Box"' started by Raymond levesque, Mar 14, 2018.

  1. Raymond levesque

    Raymond levesque Raymond Levesque

    I got the specs of .080-.125 clearance from T&A when installing the torque converter. Mines at .140 without shims. I could only find .090 washers. Using these washers brings the clearance down below tolerance @ .061
    My question is what's too much or too little? My option is to grind .030 off the washers.
    This is for a stock 400 engine with a TH 400 tranny. I won't be competing with it
    Thanks R
     
  2. Jim Weise

    Jim Weise 1000+HP

    The extra .015 is not going to hurt anything. My spec is 1/8 to 3/16 pull out from the trans. Too tight is the evil here, all your doing by pulling it out of trans is changing where the converter hub to pump drive gear coupling is happening, by the amount of the pullout... and if I recall correctly, the coupling area of the converter slot, when fully bottomed out, is about 3/4 inch.. but the pump gear tang that fits in the converter hub slot, is actually only about 1/2 inch wide. So not less contact, just in a different place on the hub.

    Next time I have a 400 pump apart, I will take some pics, and this will be very clear to everyone.

    JW
     
  3. Raymond levesque

    Raymond levesque Raymond Levesque

    Ok thanks Jim. The space right now is at .064 at all 3 mounting bolts/ foot.
    It had only .020 play with the other 3 thicker washers there.
     
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

  5. Raymond levesque

    Raymond levesque Raymond Levesque

    Thanks Larry, it looks like I can remove the washers and run it with .138 play.
     
  6. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Yup, that's within range.
     

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