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2003 Sierra 4wd wont engage

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I recently bought an 03 Sierra from a friend and was familiar with the truck. 4wd was spotty engaging and disengaging at times. I thought it was actuator but actuator is working fine. where should I look next? First post -- appreciate any help u guys can offer.

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wheels off the ground engine off in 4wd ,,,


,check frt driveshaft its engaged ...


remove actuator and push in the fork to lock the diff and see if its locked as a helper turns the pinion (input)


verify the same with the actuator in and in 4wd


remove frt drivehshaft for above ,,,


take it in to a shop if uncomfortable doing above ,,,


was a right front axle seal recently done ???

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