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 axle - front drive shaft Toyota tacoma 1998 4x4
more than like have a broken axle shaft, un hook the rear drive shaft and put it in 4wd if it wont move then you know you got a broken axle shaft or spider gears broke in the pumpkin
SOURCE: 4x4 engagement front axle dodge 2500 2001 5.9 diesel
Sounds like front universal joints have worn out,,without more info,,i cannot help further
SOURCE: 4x4 wont engage
i would check to see if power is going to the 4 wheel drive aculator. if there is power then your aculator is bad. it is located at the front diff.
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
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