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The truck has 157000 miles on it. 4in lift atlas 40 Ficm 40 HP SCT canned tune. Everything else is stock. Truck though the code P0755 shift solenoid b malfunction. Tow haul light flashes. When putting truck into D it slams into gear. When placed into R it shifts fine but the motor boags down and rpms raise slightly. When driving and slowing down at 10mph the gears slam. I replaced solenoid ( overdrive clutch SSPC-B) today along with trans filter and new fluid. Still has the same problem as before tow haul still flashes.
 

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Former Ford Trans Engr.
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I've been told that a damaged wire to the solenoid can also set that code. It has to have high resistance in the circuit so that the PCM still sees the circuit, but not enough current flows to properly activate the solenoid.

 
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