Torque converter failure mode?

Discussion in 'The "Juice Box"' started by techg8, Jul 13, 2022.

  1. techg8

    techg8 The BS GS

    This is a valid point.
     
    sean Buick 76 likes this.
  2. 12lives

    12lives If it runs, it's done!

    Is there someone near you who can take the converter apart for inspection?
     
    techg8 likes this.
  3. techg8

    techg8 The BS GS

    Ugh it's a used unknown make aftermarket unit that came w the core transmission. Definitely not worth paying anyone to inspect.
     
    Mark Demko likes this.
  4. JESUPERCAT

    JESUPERCAT No Slow Boat

    Inspection is free to little cost. Modifying and rewelding, balance is where the money comes in.
     
    techg8 likes this.
  5. Super Bald Menace

    Super Bald Menace Gold Level Contributor

    How about grabbing a used stock converter and dropping it in just to see if you have forward or reverse? A wrecking yard could probably hook you up cheap
     
  6. BRUCE ROE

    BRUCE ROE Well-Known Member

    I have had a few converter failures in 1.5 million miles. One was to
    just start slipping, as out of gear. Had one fail in service, another
    was a rebuilt that probably was not properly rebuilt. I am quit sure
    the turbine inside has broken loose from the trans input shaft, not
    at the splines, but on the mount. Trans (I had recently rebuilt) was
    fine, just put on another converter. Bruce Roe
     
  7. Jim Weise

    Jim Weise EFI/DIS 482

    It's possible.. I have had an instance in which the rivets that hold the splined hub onto the turbine sheared off. The result is exactly what your experiencing.

    Send the converter to a rebuilder, and have them cut it open and inspect it.

    JW
     
    techg8 and patwhac like this.
  8. 70skylark350

    70skylark350 Jesus loves you unconditionally

    If there was an internal mechanical failure there would definitely be piles of evidence in the pan. I’m with you on the converter theory
     
    techg8 and jaystoy like this.
  9. techg8

    techg8 The BS GS

    This is interesting. I had not considered this type of failure. Thank you.
     
  10. JESUPERCAT

    JESUPERCAT No Slow Boat

    Although different car and application..... I had a converter fail at 80 mph in the desert in NM at 11:30 at night going to the Ford vs Buick event in OK years ago. Cruise control on in the tracer scooting along and it went in to neutral, or so it seemed:eek:. Coasted 1/2 mile to an exit and into a Dairy Queen and parked. No forward or reverse. Bought my truck the next day and towed it home. On a chance of simplicity I put in a used converter from a friend
    Drove the car another 105,000 miles until the transmission failed for good.
    Maybe it's that easy with your situation..
     
    techg8 likes this.
  11. 12lives

    12lives If it runs, it's done!

    It may not be worth it to repair, but it will confirm what the failure was. If you don't care about the converter just cut it open with a cut off wheel.
     
    Mark Demko and techg8 like this.
  12. JESUPERCAT

    JESUPERCAT No Slow Boat

    Put it in your lathe. Everyone has one right:D
     
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  13. techg8

    techg8 The BS GS

    This is encouraging. I hope its that easy. Then again since Ive already torn the trans down inspected and reassembled it I guess its not that easy. Lets say I hope that a new converter is the solution.
     
    12lives and sean Buick 76 like this.
  14. sean Buick 76

    sean Buick 76 Buick Nut

    I agree, use a stock used converter to test before buying a new one.
     
    techg8 likes this.
  15. techg8

    techg8 The BS GS

    New converter installed, topped off the fluid. Motion achieved. The 73 is back!

    All is well that ends well. I actually feel better having confirmed that my initial build of the transmission was good.

    Thanks for the replies guys.
     
  16. JESUPERCAT

    JESUPERCAT No Slow Boat

    Looks like it was similar to the Tracer:D.
    Good job glad its rolling again
     
    techg8 likes this.
  17. DaWildcat

    DaWildcat Platinum Level Contributor

    Damn it, the curious part of me wants to know the converter failure mode.

    Glad all's good! Or, will be.

    Devon
     
    techg8 likes this.
  18. 436'd Skylark

    436'd Skylark Sweet Fancy Moses!!!!!

    Good deal. Grab a few cut off wheels and slice the old converter open.. i would be thrilled to see the failure.
     
  19. Mark Demko

    Mark Demko Well-Known Member

    Me too:D

    Yes, PLEASE cut it open and post pics, we wanna see:cool::p:D
     
    techg8 likes this.
  20. DaWildcat

    DaWildcat Platinum Level Contributor

    Cutting a torque converter open with cut-off wheels seems like an expensive and stinky time-killer.

    I'm curious too, but not to the extent of that. I'm spoiled, had access to a trans shop that also did converter rebuilding. Dedicated lathe and welder after clearances were set.

    Devon
     
    techg8 likes this.

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