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93 f150, manual hubs with a push button 4x4 switch on dash
transfer case is a 13-56. I push the button and the 4x4 does not engage. I hear a clicking sound which I have heard in the past coming from the interior passenger side of the cab, but the clicking doesnt seem to be the same as I have heard.
Modules?????, Grey box , interior pass. side.
Engaging celniod on the transfer case.
Last time I had it in 4x4 no problems, one month ago.
Fluid is OK
Sounds like the shift control module is on the fritz. If you do a search for your t-case, you'll find a link to a good site to dianose and self-test the module and shift motor. Good Luck!