1993 Ford Explorer

I wouldn't recommend driving more than 35 to 40MPH with the 4wd. As far as oil, the transfer case is responsible for 4wd. There is a bolt about 3/4 of the way up the back side of the transfer case. Open that. THe fluid should be to the bottom of the hole. I believe your vehicle uses ATF in the transfer case, but confirm that when you purchase it. Also, make sure that is full, but it should be serviced. Refer to the owner's manual for regular service intervals. As far as shifting the transfer case manually, you can't do it.

Let me know if you have other questions.

Joe

Thanks for the positive feed back, and thanks for using 2carpros. Com. Let me know if you have other questions.