4x4 not engaging

4 wheel not working, press button can here clank,what should i look for to diagnose which part to replace or test 95 jimmy 218568mi

4 wheel not working, press button can here clank,what should i look for to diagnose which part to replace or test 95 jimmy 218568mi

What transfer case?
What are the shift buttion lights doing.
Is front drive shaft and axel locking in.

Check for transfer case codes and post back any codes

This link may help.
http://www.automotiveforums.com/vbulletin/showthread.php?t=572914

And run a search on 4W drive shifting problems.
Lot of info from a good search.

must be np233 ,it has the three push buttons on the dash. lights light up normal,i will say that i took some air while going up what i thought was soft sand.dont know how to get codes . axles how to check

must be np233 ,it has the three push buttons on the dash. lights light up normal,i will say that i took some air while going up what i thought was soft sand.dont know how to get codes . axles how to check

Does it have a OBD11 diagnostic plug with wire on pin 13.
If so ground it and turn on key and read codes from shift button lights.

To check for axel lock in raise one fron wheel wheel and try to spin it in 4W.
If it spins and is not locked in to other wheel and it is not locking in.
Did you go to and read read this link?
http://www.automotiveforums.com/vbulletin/showthread.php?t=572914

I had a problem with my front diff not locking in. I could hear the "clank" in the transfer case also. It ended up being a vacuum line that had been cut/chewed through. Cheap fix. Just a thought.

-Caleb

it does have obdII will check it on dryer waether ,,on the vacuum line which area s should i look at