Re: 5R MODIFIED DIRECT CLUTCH SOLENOID INFO
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
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