How do you shift to four wheel drive on a 1992 jeep cyj?

Answer 1

If it is a standard:

4High - Put in clutch, use transfercase shifter (shorter shifter) and follow the shift pattern into 4H

4Low - Come to a complete stop, Put in clutch, use transfercase shifter (shorter shifter) and follow the shift pattern into 4L

If it is an automatic

4High/4Low - Stop, Put vehicle in park, use transfercase shifter (shorter shifter) and follow the shift pattern into 4L or 4H

If this doesn't work it means something is wrong with your CAD (central axle dissconnect). Which means there could be a leak in the vaccum lines, or the shifter fork in the CAD is bent or broken.