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Check first to see if the front drive shaft is turning when you put it into 4wd. If it is the problem lies either in the front differential or the vacuum leading to the actuator. Find the vacuum line coming from under the battery compartment and follow it to the actuator solenoid mounted on the firewall. Disconnect the two and connect them together with duct tape. If your 4wd engages it's probably the actuator solenoid. About a $59.00 fix.
vacuum leak or vacuum locker solenoid problem. a great way to check for both is to remove both vacuum lines from the solenoid (located on firewall above destributor), and put a connector between them, push the button on the dash and see if it locks in.
Make sure that all 4 tires have the same tread on them, if one or more of them are different, then the 4wd may not engage. I had the same problem with my blazer, I changed only 2 tires at a time. The front tires would rotate faster than the rear ones, the gears in the transfer case won't line up right.