I don't believe you can because the oil pan on vans are double sump pans and there wouldn't be anyway to get the pan out of the way because of the crossmember.
Sometimes it's possible to change the big end bearings by pulling the sump off. But to get to the small end you need to get the pistons out. And if you're pulling the sump, and the head(s) you might as well get the motor out first as it'll probably be faster.
Yes, you do not have to remove the engine.
You will have to replace it. The bearings are worn out in the blower motor.
The bearings are out of it. Replace Blower motor.
Yes, the crossmember for suspension is in front of the engine. Very easy job.
Remove the trasnsmission and you can then replace the seal.
Take the motor in to a professionl pool service company or motor rewind shop.
Can the oil pump be replaced on 1994 Ford Ranger 4.0 without pulling motor?
If the window motor runs, replace the plastic spacers with ball bearings or bolt nuts. Oliver said it.
Clean out the Throttle Body, Clean and or Replace the air intake filter, Change oil to a synthetic motor oil, Change the Main Bearings camshaft bearings. Install After Market Parts. Replace all Seals and Gaskets in the motor. Remove unnecessary weight.
It is impossible to do it you have to pull the engine
Your ignition switch has failed. There is a good chance that the wiring plug for the switch has melted slightly due to a blower motor that is pulling too many amps. You will have to replace the switch, plug, and blower motor.