Transmission Slip??
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Transmission Slip??
Hey guys,
Has anyone noticed what feels like a tranny slip when hauling or empty? After purchasing my 08 F250 back in nov, i noticed that when I accelerate heavy on the throttle, the transmission shift patterns seem to be somewhat inconsistant. I took the truck to be serviced by ford shortly after my purchase and the mechanic said what i am feeling is the electronics for the traction control. Now i know these trucks have alot of power but i doubt they have enough power to break the tires loose on drive pavement at 50+ mphs. What concerns me is earlier this morning i am merging on to the highway and I feel this "slip feeling again" To describe in further detail, it feels as if the tranny shifts up a gear and then back down a gear. From what i have noticed, the rpms remain steady and there is no smell or tranny temp issues. Any advice would be greatly appreciated!! Truck is bone stock with 22k on it!
Thanks!
Charles
Has anyone noticed what feels like a tranny slip when hauling or empty? After purchasing my 08 F250 back in nov, i noticed that when I accelerate heavy on the throttle, the transmission shift patterns seem to be somewhat inconsistant. I took the truck to be serviced by ford shortly after my purchase and the mechanic said what i am feeling is the electronics for the traction control. Now i know these trucks have alot of power but i doubt they have enough power to break the tires loose on drive pavement at 50+ mphs. What concerns me is earlier this morning i am merging on to the highway and I feel this "slip feeling again" To describe in further detail, it feels as if the tranny shifts up a gear and then back down a gear. From what i have noticed, the rpms remain steady and there is no smell or tranny temp issues. Any advice would be greatly appreciated!! Truck is bone stock with 22k on it!
Thanks!
Charles
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These trucks defuel during the shifts to help protect the transmission. I notice that just when it starts to pull decent it almost feels like it backs off, shifts, then gets going again. Its noticable. Is this possibly what you are feeling?
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Thats exactly correct. During normal driving operation the transmission shifts fine. However, when heavy on the throttle i feel this "slip". Ive also noticed the shift pattern when attempting to pass people at an accelerated pace as well. Can you explain to me the defueling operation? Are there any fixes for the defueling or is defueling as per fords design? Thanks for your input guys!!
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From: Frederick, MD
The PCM defuels during that heavy throttle to protect the trans. Think of it this way, during heavy loads and heavy throttle there can be max TQ going to that trans.
During shifting with all that TQ It might cause extra wear and slippage on the clutches.
defuel will help to protect and to preserve.
don't know if that is 100% accurate but that is my understanding of the operation.
During shifting with all that TQ It might cause extra wear and slippage on the clutches.
defuel will help to protect and to preserve.
don't know if that is 100% accurate but that is my understanding of the operation.
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thanks guys, makes a lot of sense. I may be crazy but i could swear i notice it more when operating on wet surfaces. Reading the other post, i see that there is alot of controversy concerning tuners, are either of you running tuners?
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Frmr Ford Trans Engr
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From: SE Florida
That IS 100% accurate.
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