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Old Mar 23, 2021 | 09:27 AM
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Trans questions

1. Torque converter- I was reading about a test that if you drive at 40 mph do you want it to lock up or not lock up by tapping the brakes and looking at the tach. Which one do you want it to do.

2 went for a long drive yesterday. First time I drove it that far... I noticed atf fluid was dripping out near the front of the transmission is this overheating or a bad front seal.
2a. Would having a trans cooler installed fix this?.
3. Would not having of engaged cause atf fluid to overheat and cause it to drip?


I have to install a new radiator replacing with a heavier duty one.i ordered..


Thanks shane


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Old Mar 23, 2021 | 01:43 PM
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I noticed atf fluid was dripping out near the front of the transmission is this overheating or a bad front seal.


It's a bad converter seal caused by periodic overheating. The OEM seal is gray and it is junk. When you replace it, use a blue or black seal.

Would having a trans cooler installed fix this?.
It's too late for that now.

Would not having of engaged cause atf fluid to overheat and cause it to drip?
I have no clue what you are trying to say here.

 
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Old Mar 23, 2021 | 05:49 PM
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Originally Posted by jas88
It's a bad converter seal caused by periodic overheating. The OEM seal is gray and it is junk. When you replace it, use a blue or black seal.



It's too late for that now.



I have no clue what you are trying to say here.
Meant to say overdrive

Was doing some investigating and noticed a cooler was already installed in front of the radiator. I drove it some more today and no leaks seems like only long distance caused it
 
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Old Mar 23, 2021 | 07:21 PM
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Originally Posted by Shane Asher
1. Torque converter- I was reading about a test that if you drive at 40 mph do you want it to lock up or not lock up by tapping the brakes and looking at the tach. Which one do you want it to do.
Tapping the brake pedal will cause the converter clutch to disengage.
 
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Old Mar 23, 2021 | 10:04 PM
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Originally Posted by Shane Asher
Meant to say overdrive

Was doing some investigating and noticed a cooler was already installed in front of the radiator. I drove it some more today and no leaks seems like only long distance caused it
Are you sure that is not the AC radiator?
 
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Old Mar 23, 2021 | 11:29 PM
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Originally Posted by Shane Asher
1. Torque converter- I was reading about a test that if you drive at 40 mph do you want it to lock up or not lock up by tapping the brakes and looking at the tach. Which one do you want it to do.
Torque converter lock up does not happen in first gear.
When you are driving at say 40mph, steady, and tap the brake, you should see RPM rise a couple hundred and drop again.
When driving steady, at say 40, your torque converter is 'locked up', when you tap the brakes, it 'unlocks', then locks again.

 
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Old Mar 24, 2021 | 01:40 AM
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Originally Posted by wwhite
Torque converter lock up does not happen in first gear.
When you are driving at say 40mph, steady, and tap the brake, you should see RPM rise a couple hundred and drop again.
When driving steady, at say 40, your torque converter is 'locked up', when you tap the brakes, it 'unlocks', then locks again.
So I did that and I didn't see the rpm go up when I tapped the brakes...I'll try again tomorrow
 
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Old Mar 24, 2021 | 05:20 AM
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What truck, engine, trans, this is all assuming, you dont have a C6 automatic transmission, which doesnt have OD, and therefore cant unlock torque converter, when you tap the brake pedal.
 
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Old Mar 24, 2021 | 06:11 AM
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Originally Posted by torq'ta 5 8
What truck, engine, trans, this is all assuming, you dont have a C6 automatic transmission, which doesnt have OD, and therefore cant unlock torque converter, when you tap the brake pedal.
Yep. C6 = No overdrive and no lockup torque converter.
 
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Old Mar 24, 2021 | 06:33 AM
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Originally Posted by My4Fordtrucks
Yep. C6 = No overdrive and no lockup torque converter.
4x4 e40d 5.8 l or 351w f150
 
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Old Mar 24, 2021 | 06:42 AM
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Originally Posted by Shane Asher
4x4 e4od 5.8 l or 351w f150
Fixed that for you.

Thanks for the update on what your truck has.
 
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Old Mar 24, 2021 | 12:02 PM
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Originally Posted by Shane Asher
So I did that and I didn't see the rpm go up when I tapped the brakes...I'll try again tomorrow
Make sure its warm, run it for 10+ minutes down the highway.
 
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Old Mar 24, 2021 | 08:07 PM
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Originally Posted by wwhite
Make sure its warm, run it for 10+ minutes down the highway.
So if it revs when I got the brakes it's a good thing?


Thanks shane
 
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Old Mar 25, 2021 | 11:51 AM
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If your doing 50mph, steady with gas on a little, then with left foot, tap the brake pedal, and your rpms go up and then down, then yes, a good thing.
If your off the gas, you will not notice a change, and is also normal behaviour.

This means your Brake On/Off(BOO) system in the EEC and the Torque converter clutch and Lock-up Solenoid are working as designed.
 
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