Hello all,
I used to own a Ford Fusion with the 6F35 and noticed the same thing happen on that as what is currently happening with my F150 with 6R80. As I accelerate and shift through the gears, the tranny shifts to fourth gear and shortly after the shift, the rpm will drop as I accelerate. To be clear, the shift to fourth gear occurs, normal rpm drop due to higher gear, rpm begins to climb, then rpm drops as speed increases. What is the cause of this? Doesn't seem logical to me, as how can my speed increase without rpm increasing while staying in the same gear? If this was tranny slip, rpm should increase as my acceleration stalls. Both the 6F35 and 6R80 transmissions have had regular fluid changes with Motorcraft Mercon LV.
I used to own a Ford Fusion with the 6F35 and noticed the same thing happen on that as what is currently happening with my F150 with 6R80. As I accelerate and shift through the gears, the tranny shifts to fourth gear and shortly after the shift, the rpm will drop as I accelerate. To be clear, the shift to fourth gear occurs, normal rpm drop due to higher gear, rpm begins to climb, then rpm drops as speed increases. What is the cause of this? Doesn't seem logical to me, as how can my speed increase without rpm increasing while staying in the same gear? If this was tranny slip, rpm should increase as my acceleration stalls. Both the 6F35 and 6R80 transmissions have had regular fluid changes with Motorcraft Mercon LV.