2009 Ford Ranger 4x4 (auto transmission).
Driving in 4x4 and truck jerks (feels like it's hitting bumps in the road, which are
not there). Tried turning on-the-fly dial to 2x4 but dash display shows it'a still in
4x4. How do I get it back into 2x4 to see if the jerking is only in 4x4 or not?
Sounds like you are experiencing the normal Ford failed transfercase shift motor failure, you can try haviing someone pushing the 4X2 button while you lightly tap on the shift motor, this must be done with the key on and on level ground, so make sure you block the wheels to prevent it from running over you while your under the rig, if the motor then works after the tapping then you have found your problem, if not then you will have to perform a system check on the electronic 4X4 system, I would advise you to get a shop manual for this as there are a lot of circuits to be tested. HTH
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