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  1. #1
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    Default 3000 stall converter

    Hi All
    I am looking at a Monaro with a chevy 383 crate engine 425hp TH400 3000 stall converter and 3.08 diff gears. What do you all think not sure if there is a trans cooler on it would it ok on the highway im a cruiser more than a racer but he car looks nice engine looks the part too

  2. #2
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    HI
    Best advice I have been given from convertor/ tranny shops for a cruizer is to keep stall below cruizing speed . Eg 2500-2800stall at a 2800-3000 criusing rpm etc etc

    Years ago there was plenty written about max stall for a mildly modded street car was 2500rpm with stock gearing .

    All the stall depends on tire size // cam duration // heads port size . Whats your specs ???????????????????
    Everything works as a package

    I am building similar 400sbc 3.6 gr ,AFR 195 comp head , 230/236 HR cam ,, 2600--2800 stall ,, estimated 100kph cruze 2900rpm Mid range all the way
    All the dyno sheets suggest my torque does not go down into a hole at 2800 then recover, such is the case with some big cam engines . The midrange allows me to potentially run slightly tight convertor and taller gearing if I desire.

    You running a stock radiator cooler ??
    If yes its critical u do NOT RUN your engine at cold say 70deg cel . Tranny will function better at 80deg cel or above .
    It would be recommended that u run a stock cooler and a decent aftermarket unit together .
    Last edited by swampy; 31-07-2018 at 09:24 AM.

  3. #3
    Not the Kingswood! hq308's Avatar
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    Default

    As long as it has a suitable trans cooler it will be fine.

  4. #4
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by swampy View Post
    HI
    Best advice I have been given from convertor/ tranny shops for a cruizer is to keep stall below cruizing speed . Eg 2500-2800stall at a 2800-3000 criusing rpm etc etc

    Years ago there was plenty written about max stall for a mildly modded street car was 2500rpm with stock gearing .

    All the stall depends on tire size // cam duration // heads port size . Whats your specs ???????????????????
    Everything works as a package

    I am building similar 400sbc 3.6 gr ,AFR 195 comp head , 230/236 HR cam ,, 2600--2800 stall ,, estimated 100kph cruze 2900rpm Mid range all the way
    All the dyno sheets suggest my torque does not go down into a hole at 2800 then recover, such is the case with some big cam engines . The midrange allows me to potentially run slightly tight convertor and taller gearing if I desire.

    You running a stock radiator cooler ??
    If yes its critical u do NOT RUN your engine at cold say 70deg cel . Tranny will function better at 80deg cel or above .
    It would be recommended that u run a stock cooler and a decent aftermarket unit together .
    Unless all you plan on doing is cruising, something like this you'd expect peak power at around 6000RPM peak TQ 4500, so I wouldnt have anything less than 4000RPM converter and 3.5-3.7 gear, then a large transmission cooler.. You'd make the engine go into an RPM range where it wants to be 4000-6500RPM is where it would do its best work.

  5. #5
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    Hi
    Paulzig
    Yea its been suggested to me to run a ""high""rpm stall . But as u said end use is key and that's street . Suits me maybe not others . The gearing will help a lot . Does not help my nearest strip is 5hrs drive away !!

    Need to tame power a little the smallish rear tyres will get a work out so even faster acceleration is not needed just yet.
    Last edited by swampy; 31-07-2018 at 02:31 PM.

  6. #6
    Do you ever leave? EH179's Avatar
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    Quote Originally Posted by antro View Post
    Hi All
    I am looking at a Monaro with a chevy 383 crate engine 425hp TH400 3000 stall converter and 3.08 diff gears. What do you all think not sure if there is a trans cooler on it would it ok on the highway im a cruiser more than a racer but he car looks nice engine looks the part too
    Avoid all the big hills in your area, if you don't run a cooler.
    3000 stall and 3.08 gears will heat up fairly easily.

  7. #7
    Do you ever leave? EH179's Avatar
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    Quote Originally Posted by swampy View Post
    HI
    Best advice I have been given from convertor/ tranny shops for a cruizer is to keep stall below cruizing speed . Eg 2500-2800stall at a 2800-3000 criusing rpm etc etc

    Years ago there was plenty written about max stall for a mildly modded street car was 2500rpm with stock gearing .

    All the stall depends on tire size // cam duration // heads port size . Whats your specs ???????????????????
    Everything works as a package

    I am building similar 400sbc 3.6 gr ,AFR 195 comp head , 230/236 HR cam ,, 2600--2800 stall ,, estimated 100kph cruze 2900rpm Mid range all the way
    All the dyno sheets suggest my torque does not go down into a hole at 2800 then recover, such is the case with some big cam engines . The midrange allows me to potentially run slightly tight convertor and taller gearing if I desire.

    You running a stock radiator cooler ??
    If yes its critical u do NOT RUN your engine at cold say 70deg cel . Tranny will function better at 80deg cel or above .
    It would be recommended that u run a stock cooler and a decent aftermarket unit together .
    In a standard engine with tall gears, i would agree keeping stall below cruising speed @ 100kph.

    In your application, considered a performance build, the engine will have to lug from 2900 until it gets into the torque curve.

    You have left yourself with zero flash stall at all, for those spirited driving moments.

  8. #8
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    Put the converter it "needs" into it, forget the fairy tales about cruising rpm and stall speed.
    If it gets that hot at cruise there is something wrong with the converter full stop.

    If you can avoid it, don't let your transmission run hotter than your engine, the cooler the better.

    A 383 at 425 hp will want a decent converter.

  9. #9
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    Hi
    EH179 Thanks yea not perfect for drags I no .
    If the transmission kicks down to second should be enough . The shift points become critical eg if I rev to 6000rpm in 2nd gr it changes 3rd gr and reduces rpm to 4000rpm and climbs again . So in reality stall is a little low and idealy need a gear vendors which does not drop the rpm so much due its gear splitting .

    Currently
    At 100kph in 3rd = 2800 rpm [torque rising rapidly, good for moderate acceleration ] , kick down to 2nd = 4000rpm [great for strong passing ] upto 5000rpm approx. 120kph [speed limit starts to become an issue ha ha ]

    Really selected rear gear ratio of 3.6 as a compromise between 3.5/3.7 . Mainly because of tyres as I would like to retain 14 inch wheels/tyres [limited choice eg diameters ]
    Last edited by swampy; 31-07-2018 at 08:44 PM.

  10. #10
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by swampy View Post
    Hi
    EH179 Thanks yea not perfect for drags I no .
    If the transmission kicks down to second should be enough . The shift points become critical eg if I rev to 6000rpm in 2nd gr it changes 3rd gr and reduces rpm to 4000rpm and climbs again . So in reality stall is a little low and idealy need a gear vendors which does not drop the rpm so much due its gear splitting .

    Currently
    At 100kph in 3rd = 2800 rpm [torque rising rapidly, good for moderate acceleration ] , kick down to 2nd = 4000rpm [great for strong passing ] upto 5000rpm approx. 120kph [speed limit starts to become an issue ha ha ]

    Really selected rear gear ratio of 3.6 as a compromise between 3.5/3.7 . Mainly because of tyres as I would like to retain 14 inch wheels/tyres [limited choice eg diameters ]
    I used to think like this once, trying to work numbers on cruise vs peak power, TQ, all that bullshit, then I replaced a 3500RPM 10" converter with a 5000RPM 8" converter in a car and instantly changed my mind. Not saying you should put 5000 one in but 3800-4000 with 3.6 14" rims would be good, who cares if it cruises 100kph at a bit over 3000

  11. #11
    Senior Member 355lux's Avatar
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    Dont be scared of a decent stall converter - as HQ368 stated , give the engine what is wants. I like Paul used to have all the same thoughts,, then put a decent 5000 stall in and will never go back.. Mine does about 50/50 cruising and racing.. put a decent cooler on it and you wont have any problems. The converter is probably the most overlooked and misunderstood thing in the car.
    "life is about a bag of luck and a bag of experience..the trick is to fill the bag of experience before you empty the bag of luck!!"

  12. #12
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    Quote Originally Posted by 355lux View Post
    The converter is probably the most overlooked and misunderstood thing in the car.
    People build these stroker engines, put roller cams in etc and then here it is a nice 2500 large diameter converter and they wonder why their 450-500HP engine is a slug

  13. #13
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    Well we bought the car stall is 3200 zz383 chev crate engine 750 hp street double pumper carb roller cam trans cooler external seems to go good but noticed the idle mixture screws are only out 1 turn not 1.5-2.5 turns as recomended ?

  14. #14
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    I had a small block chev in my WB ute, TH350 with a 3500 converter and 3.5 diff gears, had the biggest trans cooler I could find, I drove it everywhere and beat the snot out of it every single time I drove it without any gearbox problems at all.

  15. #15
    Do you ever leave? EH179's Avatar
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    Quote Originally Posted by antro View Post
    Well we bought the car stall is 3200 zz383 chev crate engine 750 hp street double pumper carb roller cam trans cooler external seems to go good but noticed the idle mixture screws are only out 1 turn not 1.5-2.5 turns as recomended ?
    Does the engine idle well at 1 turn out? You could enlargen the iab's to achieve the 1.5 turns out but, there is a process that needs to be understood before doing this.

    It's yours now, put the mx screws where you want.

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