It was working fine, I shifted out 4 hi then the next time months later it would not shift into 4 whell drive, it has the electric button shift.
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: Front drive, 4 Wheel drive won't engage
Check the switch on the transfercase remove the vacume lines if there is oil in them the switch has to be replaced and the lines should be cleaned out you should also check under the battery tray to make sure the boot is not ripped that controls the leaver to engage the front axel
SOURCE: 2000 gmc yukon xl 4x4 wont engage
see my posting re this at my name: rlf107. $115 in parts and labor solved for me, on a 2000 Yukon XL
SOURCE: i have 1997 gmc jimmy sl5 it will not shift out of 4 hi
I believe that this vehicle has a vacuum controlled solenoid on th edrivers side of the transfer case. This solenoid could have lost vacuum by having a broken vacuum hose or the solenoid itself is bad. To test remove the vacuum line and see if the line has vacuum going to it when running. If so replace the solenoid. If the vehicle has a electronic dash control to engage the 4 wheel drive the switch has been known to go bad. The best way to test is to see if there is voltage at the switch and to see if the voltage changes when the switch is activated. If there is no change in voltage when activated the switch is bad.
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