Torque converter running low on torque? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 24 (permalink) Old 09-28-2007, 03:45 AM Thread Starter
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Torque converter running low on torque?



Well not exactly, well i don't know maybe.... but anyways heres my situation, My truck doesn't like to blow out much black smoke after the turbo spools, even in the 100 program, (but it will smoke a lot with the TC locked, if I lug the engine) I'm thinking my torque converter is not loading the engine enough. I know im getting plenty of fuel and my truck will not set the over boost code until the TC locks up, it has no problem locking up. I just think it is too slushy until it locks up. Mind you my tranny does have 181k on it, and I installed a shift kit around 160k. Fluid is good and pink, temps stay in check, but then again I never sit in traffic for half an hour.

So heres my questing. What is the normal TC rpm difference under hard acceleration, pre lock up? My tuner is telling me it is close to 800-1000 "TC mod actual" until it locks up.

Would replacing the TC at my mileage do any harm to rest of the life of the tranny? (I am on a budjet so a full rebuild is not an option right now.)

Ideally, if it is feasible, (I think I can handle dropping the tranny and swapping the TC myself) I would like to get a good single disc, I know the tranny probably wouldn't live very long behind a triple disc. I have heard you can pick up 6oh TC for around 400 bucks and that they are the perfect match for a mildly powered truck such as mine.

What do ya'll think, I'm open to other ideas provided it is less than 4 digits.

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post #2 of 24 (permalink) Old 09-28-2007, 01:47 PM
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Re: Torque converter running low on torque?

Yup, I was gonna suggest a 6.0 converter. Call John Wood ( http://jwtt.com/ ), he's a sponsor on here. You can actually use the stouter 6.4 tc in a 6.0, so maybe you can put a 6.4 in there and call it a day.

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post #3 of 24 (permalink) Old 09-28-2007, 02:46 PM
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Re: Torque converter running low on torque?

Quote:
Originally Posted by Redfishman17 View Post

I would like to get a good single disc, I know the tranny probably wouldn't live very long behind a triple disc.
I have heard this statement a couple of times lately. Now think about it. When the TC locks up, you are in direct drive from the flywheel. It does not matter whether it is a single, triple or quadruple disk. The disk just locks up the TC. Using more disks allows for more surface area and helps reduce slippage. Before lockup the disks do nothing. What most people don't realize is the stock TC that came with your 4R100 is a triple disk. A poor one, but triple disk none the less.
Now you may have heard that a "high performance" TC can harm a stock transmission and that is true. The theory is that it's torque multiplication is higher than stock and of course the tranny can't handle it. It does that by having a higher stall speed. It slips more and the engine rpm gets higher before it reaches stall.

Quote:
Originally Posted by Redfishman17 View Post
I have heard you can pick up 6oh TC for around 400 bucks and that they are the perfect match for a mildly powered truck such as mine.
The 6.0 (5R110) TC is not a direct swap into the 7.3 (4R100). It requires a spacer for proper fitment. John Wood might be able to help you out with that. Also, it has a higher stall speed than the 4R100 TC.

PM Racer X. He knows a lot more than I.


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post #4 of 24 (permalink) Old 09-28-2007, 08:21 PM
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Re: Torque converter running low on torque?

That's a good point, about stressing a tranny with miles.

If you think about it, we're stressing the tranny enough with the 7.3's power. Why put more torque and stress on the transmission by multiplying extra torque in the converter when the engine can make enough power and torque to break parts? Not all of the Expensive Billet Converters do that, but they all do add weight as stress.

Use the engines power and Torque band with a good triple disc converter. I would stay with a triple disc but W/0 extra Torque multipication with your mileage. The triple disc you already have only affects lock-up apply feel and holding power.
The 3 fresh discs in a new converter aren't what causes a shorter life in a transmission with mileage. You have a shift kit already. If it's more than a valve body kit that needs to be considered, and matched to a new converter.
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post #5 of 24 (permalink) Old 09-29-2007, 02:10 PM Thread Starter
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Re: Torque converter running low on torque?

Yeah its just a simple Bulley Dog shift kit, there no pump mods or anything. So I guess the stock weak torque converter is what has been making the tranny last all this time. Maybe my funds are better appropreiated for a BTS fund then? I think all i can benefit then is with better holding power, its does take a few seconds to lock up if im just cruising at 70, hit the brakes, it un-locks, then floor it is when it takes a few seconds to re lock. Otherwise it locks up just fine on a hard acceration from a dead stop. Thanks for all the input ya'll.

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post #6 of 24 (permalink) Old 09-29-2007, 05:17 PM
 
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Re: Torque converter running low on torque?

Quote:
Originally Posted by Redfishman17 View Post
its does take a few seconds to lock up if im just cruising at 70, hit the brakes, it un-locks, then floor it is when it takes a few seconds to re lock. Otherwise it locks up just fine on a hard acceration from a dead stop. Thanks for all the input ya'll.
That's the programming
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post #7 of 24 (permalink) Old 09-30-2007, 03:52 AM
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Re: Torque converter running low on torque?

Quote:
Originally Posted by gregrob View Post
That's the programming

You can add up to 9 seconds delay with a solenoid pack mod alone.


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post #8 of 24 (permalink) Old 10-04-2007, 07:43 AM
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Re: Torque converter running low on torque?

6.4 converter behind a 7.3 , yes and it's better than the 6.0 converter.but you halfto change the flexplate too because the 7.3 converter has 6 studs ,and the 6.4 converter has 8 studs.been running mine for about 8 mos now.....look at my sig...

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post #9 of 24 (permalink) Old 10-06-2007, 04:05 AM
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Re: Torque converter running low on torque?

Dave,

You said 'but you halfto change the flexplate'

To what? Where do we get one?

Sounds like a very easy upgrade.

MrBill.

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post #10 of 24 (permalink) Old 10-06-2007, 07:54 PM
 
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Re: Torque converter running low on torque?

Quote:
Originally Posted by MrBill1 View Post
Dave,

You said 'but you halfto change the flexplate'

To what? Where do we get one?

Sounds like a very easy upgrade.

MrBill.

John Wood can get you what you need to install the 6.4 converter
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