I believe you have two actuators--one for the transfer case and one for the front differential. Check that diff is engaging.
Have you had the transfer case fluid changed? It might be too late - but could be worth a shot.
http://www.s10forum.com/forum/f222/transfer-case-fluid-change-61696
SOURCE: I have a 95 explorer xlt 4.0L V6. The 4wd does not
the front axle bearing could be shot. This is common. Also the hubs may not be locking which is even more common
SOURCE: front tires wont engage in four wheel drive
if the actuateor is vacumed,you might have have a hose that came off or it has a split in it somewhere,check that.or if you have posilock hubs one or both may be wore out or lacking grease,they are easy to remove,just a hex wrench and snapring pliers is all you need,remove and inspect for obvious sighns of wear.
SOURCE: 1991 F150 front axle not locking in.
Front hubs need to be taken off and inspected for damage,
Replace as necessary.
SOURCE: front axle is not engaging when put i 4wd,2000 gmc
is the front tail shaft turning,if not problem is in transfer case
SOURCE: 1989 2500 4x4 Transfer
if you have to lock the hubs Manuely thay need to be rebuilt /if thay are automatic same thing first have some one look under the truck and make sure the drive shaft is turning if you find no problem's with what was looked at the last thing to check is the ring and pinion in the front rear good luck
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