5R MODIFIED DIRECT CLUTCH SOLENOID INFO - Page 10 - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #91 of 91 (permalink) Old 10-21-2016, 02:33 AM
Former Ford Trans Engr.
Mark Kovalsky's Avatar
Join Date: Aug 2007
Location: SE Florida
Posts: 2,739

The reason for the occasional flare is rooted in the design of the transmission. The 3-5 shift is made by releasing the intermediate clutch while simultaneously applying the direct clutch. The release and apply have to both finish within 0.030 of a second of each other or the shift is going to suck. The adaptive software continuously updates the pressure for the shift to try to keep it consistent, but it's a losing cause. Very, very small changes from one shift to another can affect the time a clutch needs, causing the flare. In short, the trans design is too sensitive.

Former Ford Automatic Transmission Engineer

“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson
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