ST400 Low/High Stalls

Discussion in 'The "Juice Box"' started by johnriv67, Mar 29, 2018.

  1. johnriv67

    johnriv67 Well-Known Member

    Are the low and high stalls 1200/1800 respectively in a stock application as installed from the factory? I'm just trying to learn what I'm working with.
  2. 455monte

    455monte Well-Known Member

    Depends on the car weight and rear gear and also how much torque your engine produces at lower rpms.
    If u are using the sp 400 converter which is 13 inch i believe its tighter than the sp300 converter which is 12 inch i believe.Both are a direct fit in a sp400.
  3. wkillgs

    wkillgs Gold Level Contributor

    The 65-66 GS used the smaller 12" converter similar to one in the 300 engine, stalls around 2000/3000 rpm. A V6 converter will have an even higher stall behind a big block.
    Last edited: Mar 30, 2018
    PGSS likes this.
  4. johnriv67

    johnriv67 Well-Known Member

    1967 Buick Riviera with the 400, so likely a 13" converter. What would you estimate the stall to be?
    Another way I could figure it out is with a brake torque, but I am away from the car for another week and want to have a good idea of the ability of the switch pitch.
  5. PGSS

    PGSS Well-Known Member

    Last edited: Mar 29, 2018
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  6. PGSS

    PGSS Well-Known Member

  7. johnriv67

    johnriv67 Well-Known Member

  8. johnriv67

    johnriv67 Well-Known Member

    "The converter changed stall speeds from 1800 rpm to 2600-2800 rpm"
    PGSS likes this.
  9. PGSS

    PGSS Well-Known Member

    Glad I finally helped someone a tiny bit for once..Plus a few other's chimed in!
    Last edited: Mar 31, 2018
  10. LaneSutterby

    LaneSutterby broke college kid with a love for fast cars

    Got a SP400 question, but not about torque converters... I've heard that the output shaft outer diameter is smaller than a normal TH400's, is this true?? If so, in theory, couldn't a regular TH400 slip yoke be chucked up in a lathe and turned down to fit?

  11. telriv

    telriv Founders Club Member

    The output shafts are the same size. Use the rear housing from a newer TH400, it's a bolt-on, & change the yoke with the newer one.
    300sbb_overkill likes this.

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