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Discussion Starter #1
Hey guys and gals. My trans is finally going out. So I am now looking to
upgrade. So far I'm seeing to get the newest model 4r70w that I can.
BUT my biggest thing that I've come across yet, and I can't seem to locate
anything with help of the 'Search this thread' bar, is what is the best
recommended high stall converter for our cars? I basically have a bone
stock engine, but I am..slowly..building another 4.6 with windsor PI heads
and PI intake. So lets hear the recommendations. I'm very eager to get
this underway.
 

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contact chris at circle d would be my recommendation
 

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You need to stall the converter appropriately for the mods. The purpose of higher stall is to get the engine to the powerband quickly when the engine's low RPM band isn't very useful for high performance applications. You don't want to stall too high such as to skip part of the useful powerband.

For a simple PI swap, stall at least 2400 (e.g. one of the stock 11.25" converters) will wake the car up, but 3000-3500 is ideal. Down the road if you shift the powerband higher, stalls of 3800-4200 become more appropriate.

Aftermarket converter manufacturers I recommend include PI and Circle D. I recommend you do not consider Alan Brown.
 

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The purpose of higher stall is to get the engine to the powerband quickly when the engine's low RPM band isn't very useful for high performance applications. You don't want to stall too high such as to skip part of the useful powerband.
The purpose of the torque converter is to multiply engine torque. When the TC goes into "stall", the turbine and impeller are turning at about 90% RPM difference and is no longer acting as a torque multiplier. A high stall torque converter extends the torque range.
 

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Discussion Starter #5
Thanks guys! I understand completely how the converters work and
everything along those lines. I actually passed the drive trains class
at Wyotech in Laramie with 104% because I was that enthused with
the subject. Not trying to brag or anything..(okay maybe a little) :D
I just wanted a figure of what stall speed usually works best with the
PI top end swap, and which brand to run with. I would hate to spend
a good amount of money on a TC and not be happy with the performance.
 

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50 years of Mercury Cougar 1967/2017
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Don't get anything less that the 3-3500 rating. As long as it locks up, you'll never have to upgrade it unless your RPM range increases.
 

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WOT Junkie and avid corn burner
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I have a 4000 stall PI triple plate modified by Dirty Dog. It works very well with my setup, it'd work better if I had traction.
 

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Discussion Starter #10
Haha that's what I've actually been wanting to accomplish Black Cat.
The only downfall is I've heard a lot of people saying that a 5 speed
on IRS leads to snapped half shafts. I don't know about you, but I can't
NOT do 4000 rpm clutch dumps when I'm in my own RWD v8 car.
 

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Haha that's what I've actually been wanting to accomplish Black Cat.
The only downfall is I've heard a lot of people saying that a 5 speed
on IRS leads to snapped half shafts. I don't know about you, but I can't
NOT do 4000 rpm clutch dumps when I'm in my own RWD v8 car.
I've been doing 4-4.5k rpm clutch dumps on my stock V8 axles, no issues. Just kick that clutch in if you start wheel hopping, that's what ultimately ruins these axles.
 
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