Torque Converter Help Please

Discussion in 'The Engine Bay' started by wildweaselmi, Oct 8, 2016.

  1. wildweaselmi

    wildweaselmi Registered Member Premium Member

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    I have a 91 with a GM Crate HT383 motor and a 700R4 (or the 4l60 without the e).

    The trans guy put a 3500 stall converter and its sluggish. My thought is it should be a 2800 stall but looking for advice to get the most power (Highway and Offroad)

    Gearing: 4:56
    Tires: 37.5"

    Attached power band for the HT383 motor thinking it might help a professional help me dial this in. I would like to do this just one more time if it all possible.
    ht383_1750.png
    ht383_2625.png
    ht383_3500.png
    ht383_4375.png
     
  2. bigblock72

    bigblock72 Elmer's glue taste tester Premium Member GMOTM Winner

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    With 300 ft. lbs right off of idle there is no reason to run a loose converter. Just save yourself a lot of grief and get a good quality furnace brazed stock type converter and be done with it. Make sure the lock-up is functional so you don't overheat the crap out of the trans when driving down the highway.

    With 37" tires you could gain a lot by going to 5.13 gears and the motor will pull overdrive a lot better especially in hilly terrain.
     
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  3. Greg Ducato

    Greg Ducato 1/2 ton status Premium Member

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    You shouldn't need anything more than 2500 stall with that engine and might be able to use less. What is the idle RPM in Park right now?
     
  4. sreidmx

    sreidmx Fortify Offroad Vendor

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    I agree, if that doesn't have a very big cam or requires a higher idle for vacuum I'd run a 1800-2000 and max a 1900-2100
     
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  5. wildweaselmi

    wildweaselmi Registered Member Premium Member

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    Ended up getting a Hughes Performance 3stage 2200-2400 rpm stall. Works much better.
     
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  6. Greg Ducato

    Greg Ducato 1/2 ton status Premium Member

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    Good choice, Hughes builds a nice converter.
     
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  7. retroblazer

    retroblazer 1/2 ton status Premium Member

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    I would agree with an earlier remark that your gearing is on the high side. I run 4.88's in my Sub with the same 383/4l60e with 315's.
     
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  8. wildweaselmi

    wildweaselmi Registered Member Premium Member

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    I can agree. It's a bit sluggish on take off but some semi minor upgrades should increase torque and HP that I'm hoping will compensate for the lower 4:56
    Still fine tuning. I feel the 6" BDS suspension leaf spring kit raised it more than I expected (which helps that low hanging transfer case). Wish I spent the cash for coil over suspension but coulda, woulda, shoulda doesn't help. :)
    I'll run what I have at the moment.
    Have a bad vibration and I believe it's because the shim is wrong for the rear axle. I have no angle on my u-joint. It's pretty much a straight shot pumpkin up to cv joint at transfer case. That's the next fix
     
  9. sreidmx

    sreidmx Fortify Offroad Vendor

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    With a cv it should be like that anyway..
     

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