I am needing to replace the oil pump in a 1990 ford ranger. I am not sure if you can do it without lifting the motor. Also I have been told that I need to replace the oil pan gasket with the one for a 1993 model due to problems for the 1990-1992 models.
Replacing oil pump on 1990 Ford Ranger
According to the shop manual, you must remove the engine to remove the oil pan.