TC stall problems... - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 11 (permalink) Old 06-30-2009, 02:30 AM Thread Starter
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TC stall problems...

I converted from a 6-speed to an auto in April and everything is fine but the TC. I rebuilt the trans with all the good stuff and use a PCS for the controller. I first bought a $450.00 Durabuilt TC and it would stall 31-3200 rpm at full throttle and at part throttle, it was a big, mushy mess. Mako dist. gave me the runaround on taking it back or swapping it, so I just kept it and bought a PI Stallion from BTS for $1050.00. I got it in and it stalled 3100 rpm and was a little tighter at part throttle, but still sucked going up hills and towing when the TC was unlocked. Brian has been great and sent me another TC and I just got it put in today and it does the same thing. In 4x4, my truck will flash it to 2800 rpm with the brakes on and then when I let it go, it goes to 3400, shifts, then falls back to 3100, and then repeats the process until the TC locks up at 75 MPH or so and then it drops to 2200 rpm.

I think it's odd that all three TC's from cheap to hi-dollar all perform the same. My next thing I am going to try is to take it to Brian and let him iron it out as I'm sick of putting in TC's. The trans doesn't slip, it shifts great, and locks up the TC whenever I tell it. Anyone have any other ideas on what could cause this? Brian says I should see 1900-2200 stall with 320-340 rwhp.

David Willingham
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post #2 of 11 (permalink) Old 06-30-2009, 02:43 AM
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Re: TC stall problems...

You definitely have a problem, it takes 600+rwhp to flash a PI like that.
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post #3 of 11 (permalink) Old 06-30-2009, 05:17 AM Thread Starter
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Re: TC stall problems...

I'm glad you agree. I just wanted to make sure this is not the way my truck should perform. I am wondering if there is a sealing ring failure, restricted passage, etc, that is causing these stall speeds. I put the bypass tube back on and bypassed the aftermarket trans cooler to rule out a restriction there. I'm going to call Brian tomorrow and maybe send him a video of the tach and the pcs screen and see what he thinks. Then I may get an appoinment and let him fix it.

David Willingham
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post #4 of 11 (permalink) Old 06-30-2009, 10:06 PM
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Re: TC stall problems...

Man we should share some stall. I installed a pi converter and it stalls at 1000rpm. Feels like i have the ebrake on when i take off. And no the brake aint on.

RDRCM #29
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post #5 of 11 (permalink) Old 06-30-2009, 10:12 PM
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Re: TC stall problems...

This stuff scares me....
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post #6 of 11 (permalink) Old 06-30-2009, 10:36 PM Thread Starter
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Re: TC stall problems...

I talked with Brian today and I am going to take the truck to him. He said he may try a "cummins" TC for the cummins/4R100 combos and see if that gets the stall down where I want it. He is going to drive it first and then decide what needs to be done to it. I want a stall of around 2200 rpm. My appt. is July 20, so maybe I will get this thing right finally.

David Willingham
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post #7 of 11 (permalink) Old 07-04-2009, 06:18 PM
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Re: TC stall problems...

What mods if any did you do to the pump? A pump cavitation or converter feed circuit issue could also cause your problems.

Feel free to pm me on the 460forum, dont get on here much lol.

richter69
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post #8 of 11 (permalink) Old 07-04-2009, 06:26 PM
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Re: TC stall problems...

Quote:
Originally Posted by powertrip View Post
Man we should share some stall. I installed a pi converter and it stalls at 1000rpm. Feels like i have the ebrake on when i take off. And no the brake aint on.
You need a new converter...Your stator is no good
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post #9 of 11 (permalink) Old 07-05-2009, 12:50 AM
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Re: TC stall problems...

............or the sprag aint workin'

If I remember correct the PI uses an Allison stator, either is been swapped for a different type or profile, of the sprag is done.

Not what he wants to hear, but with a used converter you dont know if its hurt or someone has had it modified somehow.
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post #10 of 11 (permalink) Old 07-05-2009, 10:31 PM
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Re: TC stall problems...

that is what i have been told, prolly the sprag is no good. Bought it used and was told it was a good converter.

Can it be fixed or is the whole converter junk?

RDRCM #29
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