SOURCE: 1990 GMC Sierra 4x4 1500
the connections near the front axle that activate the motor to engage the system aren't melted? That's a comon problem for that body style. If there good, sounds like it could be that motor itself. To figure out if it's you motor or transfercase, jack up the rear end, have a friend inside shift into 4 wheel drive, or try to, and put it in gear and apply some gas. If the front driveshaft is turning then it's something with the front end. If not, farther back in the system.
SOURCE: 1998 jimmy 4 wheel drive problem
are any of the lites on the switch flashing? you may have a sticking 4x4 shift motor on the transfer case. with a helper, key on someone under vehicle at shift motor, one operating the 2wd button, give shift motor a rap with small hammer on metal portion of shift motor to see if you hear it trying to work. to access control module, remove plastic right kick panel and its right there. remove connector and inspect for corrosion or bad connection. also try park and neutral, may even have to be rolling a bit to disengage. let me know how you make out and will help further if i can. do you know what transfer case system you have? np1 or np4?
SOURCE: 2004 GMC JIMMY 4X4
I have had the same problem with my Jimmy. While on a road trip in 2WD same as you, I slowed down for gas and same thing, nasty grinding. The problem is the collar that engages the front differential was grinding against the gear, eventually causing it to weld itself together. Putting the vehicle in 4WD takes the pressure off the fork which slides the collar over the gear. THE CAUSE OF THE PROBLEM is the air actuated switch on the transfer case, which is directly controlled by the switch on your dash. This switch gets hung up half way and causes the fork in the diff to move half way, which is where you get your grinding. Its incomplete meshing of the gears. The fork in the front diff is controlled by air from the air switch (or vacuum, lack of air, I cant remember) Take your jimmy to your local trans. and gear shop and have them check it out. The switch on the transfer case costed me $40 and replacing the bad gear and collar in the diff costed me $280. I did not have to rebuild the entire diff. Make sure you are not paying for parts you do not need. ask lots of questions!
Hope this didnt sound too complicated. By the way, I am also a fully certified truck transport mechanic.
Hope this helps.
SOURCE: Noise in front end 2002 zr2 blazer
Two things maybe your problem:1 .Front axle actuator to engage 4wd is not releasing. 2. Front axle u-joint needs replacing. Lift car on jacks with front end off ground. Then spin tires by hand as fast as you can and see if you hear the noise and where it is coming from ( spin in both directions).
Testimonial: "Thank you! It was the actuator that was causing the problem."
SOURCE: 2004 chevy silverado 1500 4 wheel drive wont work..
try selecting from nutreul or less then 3km
Car will not go into
4WD high or 4WD low?
http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html
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4X4 Truck makes roaring noise in the front end?
http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html
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No 4x4 light on dash?
http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html
----------4 wheel drive system will not disengage?
http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html
------4WD light is flashing and beeping? NO 4WD
high?
http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html
--------This details will help.Thanks.
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