TC question.

Discussion in 'The "Juice Box"' started by ravensbud, Feb 4, 2018.

  1. ravensbud

    ravensbud Silver Level contributor

    745ECF1A-2AF4-4761-A41C-D648127694B7.jpeg 4260C277-F872-4AE3-BD8C-B2E11974ACF6.jpeg

    So I had this ‘69 TH400 in my Skylark for 30 years, behind an olds 400. Putting a Buick 400 back in it and freshening up the tranny. Pic on the right is the converter that was in it. It has a straight neck and looks like it was wobbling around on the shaft.

    Pic on the left is a ‘70 Electra converter, which has a machined lip in the neck that matches the tranny shaft (at end of pointer in the pic).

    So why the difference between these two? And most importantly, which one should I use? I would think the Electra converter...
     
  2. HotRodRivi

    HotRodRivi Tomahawks sighted overseas

    show the pump.
     
  3. Bens99gtp

    Bens99gtp Well-Known Member

    Why are you putting a used converter in a fresh build??? Did you at least gave the flushed???.

    No clue what the machine lip is but the old converter on right the marks inside look to me like it rub/drug the turbine and stator shafts when tried g to line up. There is nothing else the inside of the snout can rub on......once in, that area of the snout is what drives the gears.....I don't think even if it had a bad bushing that it would rub when spinning.


    Plus if it was hitting when spinning I think the damage would be a lot more then those surface scratches
     
  4. ravensbud

    ravensbud Silver Level contributor

    Same pump number on both trannys. I did measure the inside diameter on both converter snouts and the Electra converter is about 50 thousandths narrower. I haven’t tried mating it to the ‘69 tranny yet but I’ll do that this weekend. If it slips on that’s the one I’ll use.
     

    Attached Files:

  5. ravensbud

    ravensbud Silver Level contributor

    This isn’t a “fresh build”, just a used 400 engine and degreasing and visual inspection of tranny with a new filter and gasket. I’ll have the converter flushed.
     
  6. Bens99gtp

    Bens99gtp Well-Known Member

    It's always cheap insurance to have it flushed with any kind of miles, if it's unknow, or parts failure.

    If you look at the pic below it shows the inside of a 400 punp. The open lugs on your converter go over the tanks on the inner pump gear in the center. The rest of the convert snout actually sits inside the inner gear. The bushing you seen below could go bad, but the snout won't flex enough to hit the startor shaft. As once bolted to flex plate it spins in a place.

    I think those look like engagement marks as we all spin it to line it up. Looks like it was on the turbine shaft and spun. As fast as that spis if it would be rubbing the turbine shaft it would be much more marks and deeper than that
     

    Attached Files:

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