You need to pull the senser, and fus and make sure that the connectors are clean. If there is and dirty build up on the contact areas, there will be a power surge or crossfire that will make your 4X4 engage at any moment. aalso, you may think about changing up the internal sensor in the transmission. The internal sensor runs about 150.00-250.00 not including labor. If you are good at doing your own repairs, you wil save the shop labor costs.
Good luck.
Jeff
SOURCE: Service 4x4 warning light on.
you need to take it to a dealer or reputable independant and have the 4wd system check...the transfer case controller is detecting some fault in the system
SOURCE: Dodge 4x4 Doesn't Engage
It's probably the actuator located on the front axle on the passenger side. Also, check all your vacuum lines to make sure there's no broken or leaking lines.
SOURCE: No 4wd in a 1998 dodge ram 2500 w/360
check behind the right side of the front axle and look for 2 vacuum lines to see if they are still connected. also check on driver side just infront of the transfer case and check the vacuum lines to see if they are still connected. usually the problem is the vacuum lines have become caught on something and disconnected themselves.
SOURCE: 1999 dodge ram 4x4 transfer case
is your fluid the right grade check shift linkage loose or worn or binding manual shift or bad shift fork or moter on automatic shift
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