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Old March 27th, 2011, 10:21 PM   #1
CHEROKEEMUDMAN01
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stall converter question

i am having my trans built and i had an idea of what i wanted in mind and my trans guy has another. here is the specs a bone stock 318 from 1986 a 727 trans 231 t case and 4.88 gears with a 35" tire. i was thinking a 2500 stall would be good but he really wants me to go with a 3000. what is everyones thoughts. i mud bog and do some rock crawling. i dont drive it much on street but i dont want to make it not street friendly.
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Old March 27th, 2011, 10:27 PM   #2
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2500 is not very street friendly. 3000 is even worse.
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Old March 27th, 2011, 10:34 PM   #3
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you dont need more then 2000 with a stock cam, any more then that and you will just be losing torque and building extra heat.take the money you saved and buy a really nice tranny cooler.
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Old March 28th, 2011, 08:58 PM   #4
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got a 34,000 gvw cooler on jeep. thinking of throwing a mild cam in motor while i have it pulled from jeep. is a 2500 going to be to much then also
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Old March 28th, 2011, 09:20 PM   #5
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You have conflicting uses for converter choice. For rocks, technical wheeling and street driving, the lowest possible stall is best to be able to keep the best control or your vehicle and not break so many parts. Plus you'll look like an asshole doing essentially 2500-3000 rpm clutch dumps where finesse is key.

For the mud bogging you want the opposite - here you want the converter that will put you at or very near the peak power curve of you're engine. This is best set-up by running the engine on a dyno so you know exactly where power starts building and where it fall off. A 3000 rpm stall speed does you no good if your cam stops producing power at 4500 rpm.

My suggestion to you is DO NOT LISTEN to the tranny guy and decide yourself what type of driving you want the jeep to best suit. Then, figure out what cam you have or want and pick a converter stall speed just a couple hundred over the rpm the cam begins to make power. Also, be realistic when choosing a cam based on the jeeps more dominant usage for most off and on road situations a cam producing most of its power in the lower rpms is much more effective than the alternative.

EX: My 302 has a cam that starts its power curve at 1800 rpm, I chose a converter that stalls at 2000-2200. It worked pretty good, I would have rather had a lower rpm for offroad, but the cam was worthless at low rpm.
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Old March 28th, 2011, 09:43 PM   #6
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Quote:
Originally Posted by bigblockford79 View Post
You have conflicting uses for converter choice. For rocks, technical wheeling and street driving, the lowest possible stall is best to be able to keep the best control or your vehicle and not break so many parts. Plus you'll look like an asshole doing essentially 2500-3000 rpm clutch dumps where finesse is key.

For the mud bogging you want the opposite - here you want the converter that will put you at or very near the peak power curve of you're engine. This is best set-up by running the engine on a dyno so you know exactly where power starts building and where it fall off. A 3000 rpm stall speed does you no good if your cam stops producing power at 4500 rpm.

My suggestion to you is DO NOT LISTEN to the tranny guy and decide yourself what type of driving you want the jeep to best suit. Then, figure out what cam you have or want and pick a converter stall speed just a couple hundred over the rpm the cam begins to make power. Also, be realistic when choosing a cam based on the jeeps more dominant usage for most off and on road situations a cam producing most of its power in the lower rpms is much more effective than the alternative.

EX: My 302 has a cam that starts its power curve at 1800 rpm, I chose a converter that stalls at 2000-2200. It worked pretty good, I would have rather had a lower rpm for offroad, but the cam was worthless at low rpm.
Well said, I would think the 2500 ish would work out good for ya.

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Originally Posted by ChevyRacer1981 View Post
2500 is not very street friendly. 3000 is even worse.
Not really true, I drive my Mustang all over with an 8" converter that goes 5600+ stall.
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Old March 29th, 2011, 09:33 PM   #7
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thanks for help guys. ended up going with a 2400 and hopefully it will work out ok.
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Old March 30th, 2011, 06:21 PM   #8
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the biggest thing is keeping it cool. the 2400 should be fine for what your doing but be very generous with coolers. the higher the stall the more heat it will make. the hardest part is choosing a convertor for a street car that you have a radical cam in but your situtation should be fine.
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Old March 30th, 2011, 06:36 PM   #9
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I ran an 1800 stall in my Dakota years ago with pretty much the same set-up you are running. It was great for street and sand, but that was before I got into the rock crawling scene.
I don't know that I'd want over 2K doing that, but for everything else you do, I think that you'll like it.
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