4 wheel drive will not engage on 1991 Chevrolet S10

I have a 1991 chevy s-10 4x4 that when I pull the lever to put into 4 wheel drive and it sounds like its engaging, and feels like it, but the front wheels do no lock in

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2 answers
There is a front axle actuator that must engage also to lock in the front tires, i would have it tested/inspected to verify proper operation

try changeing the cencers on the tran.