Transmission slipping under WOT - Ford Powerstroke Diesel Forum
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Old 05-26-2013, 05:28 AM
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Transmission slipping under WOT

My truck has 86,000 miles on it and lately ive noticed the transmission seems to be slipping under WOT. Under normal driving conditions the truck shifts great and you would never know theres a problem. Im wondering if this could be a torque converter going bad or the transmission is on its way out. I just dropped 3500.00 dollars 3 months ago having it bullet proofed and cant afford a new tansmission.
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Old 05-26-2013, 06:18 AM
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look at the pid desired tcc slip and actual tcc slip on a scan tool.
This will tell you right away.
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Old 05-26-2013, 06:28 AM
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cfd_shop, thank you for replying so quickly, not to sound stupid, but how do it do that.. Never had to deal with this so this is new to me. All i have is a SCT 3015 programmer
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Old 05-26-2013, 06:32 AM
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Quote:
Originally Posted by Daxman View Post
cfd_shop, thank you for replying so quickly, not to sound stupid, but how do it do that.. Never had to deal with this so this is new to me. All i have is a SCT 3015 programmer

ok you would need a more advanced scan tool.
Not the best test but if you hit the brake the tcc releases. What happens if at wot when it is slipping if you lightly press the brake, that would unlock the tcc and maybe you could get an idea if its the clutch.

The other thing that can slip is the stator clutch that is allot harder to diagnose.
That is still part of the converter.

How does the fluid smell? look?
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Old 05-26-2013, 06:36 AM
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Thanks i will try that, it was really late when we got in this morning so it was too dark to check the fluid, im about to check it now.
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Old 05-26-2013, 06:57 AM
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Ok i just checked the fluid and compared it to some new fluid and its the same color, not any darker but it does smell a little different than the new fluid so im not sure if thats because its older or not. The only way i can explain how it smells is kind of like a new float when you unrapped it from the plastic. Its not real strong but it smells somewhat different, the fluid was change about 30,000 miles ago.
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Old 05-26-2013, 07:05 AM
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That sounds normal.
On the 5r110 the tcc lockup is the start of the cooling cycle so it could just have gotten hot
How is trans fluid temp?
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Old 05-26-2013, 07:10 AM
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All i have is the temp gauge on the dash which i know is crap but i never pull anything and it never moves. The funny thing is the truck shifts great until you WOT it and then it acts funny. If you get into it hard from the take off it seems fine, its after 2nd where it acts up. I dont know, maybe its on its way out slowly.
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Old 05-26-2013, 07:15 AM
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Quote:
Originally Posted by Daxman View Post
All i have is the temp gauge on the dash which i know is crap but i never pull anything and it never moves. The funny thing is the truck shifts great until you WOT it and then it acts funny. If you get into it hard from the take off it seems fine, its after 2nd where it acts up. I dont know, maybe its on its way out slowly.
That really sounds like a tcc slip, or maybe just a bad solenoid, or debris in the small orifice.
take the pan off and blow air in the ends of each solenoid, you should hear the valve inside click.
you can switch tcc solenoid with another solenoid and put the pan on and recheck as well.
Just be careful because there are 2 types of solenoids in the pan, inversely proportional and directly proportional. Do not mix them up.
Also you can change the filter and check pan for debris etc while it is down.
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Old 05-26-2013, 07:19 AM
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cfd_shop, thank you soooo much for the time and answers. Im going to start there first and hopefully that will fix the problem. Thank you again
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