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Is it possible to adjust the shift points on a E4OD? Mine feels like it is up shifting to quickly from a stop and bogging down. If I shift manually, or start with the shifter in 2nd it is ok. I have a 95 F250, 351, 6" lift, 37" tires, 4.10's in the rear.
Did you recalibrate the speedo for the tires? If not the shift points will be off.
X2 Your truck uses a PSOM to divide down the signal from the rear VSS sensor. This PSOM supplies the drive signal to the speedometer/odometer as well as the Powertrain Control Module (PCM). Those tires you put on are throwing off the shift point calculations.