My door ajar warning light and interior dome light come on and off for no reason. I believe the problem is the switch in the door that tells when the door is open. The switch is out of view so I do not know if that is the problem.
My manual transmission grinds when shifting into 3rd and 4th gears only when the vehicle is at high rpm. (over 2500)
The ford ranger is a good light duty truck.
For heavier duty work the Ranger is a little weak.
I have the dome light problem too. Some extra WD-40 in the door latch helps. The Ford Dealer also told me the actual switch is inside the door. I've only had to WD-40 it the past three years, usually in the winter.