Jeep Trans/4x4 probs

I have a 1986 Jeep Wagoneer Limited -- Select Trac 4x4. It will not go into 4 wheel drive -- hi or low and also the high range/low range shift lever will not move.

Any suggestions, ideas, opinions; please post or email me directly:

[email protected]

Thanks

check the linkage, sounds like a good pace to start