Sportrak 4 wheel drive problem

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Hi - I'm new to Sportrak ownership. I have a 93 ELXi with automatic hubs. It seems that I cannot select 4wd. The transfer box seems to work OK - light comes on in the dash when 4H or 4L is selected - but only the rear wheels turn.

There are no abnormal graunches or knocks. It's just that I don't have drive at the front wheels. Any ideas what this could be and on how to fix it?

Many thanks for all suggestions

No 4X4

Had same problem with 1992 Rocky. I changed the hubs to manual, just finnished last night. Seems to work good.
Ken