Re: 4WD issues
You could take the front drive shaft off to disable it. You could also do some fluid flushes on the differential and transfer case to see if it actually is out of fluid and put some fresh in there.
You could also crawl underneath and manually shift the transfer case with a pliers/ vise grips. I don't know exactly what you have to do to do that cuz I never had to do it.
1996 Ford Ranger STX 4x4 4.0L
1983 Honda Shadow VT750C