4x4 diff wont kick in with the actuator please help!!!

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96liftedchevy

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here is what i have done when i hit the switch in the cab to go into 4hi i hear the transfer case kick in but the actuator just vibrates but doesnt move, so i took it out and let it hang, i lefted the passenger side tire and i took a screw and manually pushed in the diff in and then turned the tire and it went in to 4x4, so i put the actuator back in and did the same thing but all it did was vibrate, i then changed the t case switch and still same thing i have replaced the tcase switch,cab switch,and actuator and the parts are getting the volts they need so why wont the actuator push the diff into 4x4 if any one has an idea please help! the truck is a 96 silverado
 
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