4 wheel drive low gear not working on 1998 Ford Explorer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
tried shifting on hard surface and moved it forward and reverse and still did not engage
(2) Answers
Does 4x4 hi work? They have a lot of front auto lock hub problems!
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