Your transfer caseon your 1989 jeep grand wagoneer will not engage?

Answer 1

If the shift lever on the floor won't move to engage there is most likely a linkage problem.

If the linkage seems to move and you shift the lever under the dash from 2wd to 4wd and the transfer case does not engage look for a vacuum problem. the lines can be very brittle and break easily. There is a vacuum motor on the transfer case that must work in order to engage the 4wd. if all of these seem to work then the problem is likely to be internal.