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It is a safety device that prevents selecting two gears at the same time. If that happened the gearbox would be destroyed.
The problem could be in the gear selector or the shifter linkage. Ensure the selector is not broken. Also, make sure that the neutral safety and the brake interlock switch are working simultaneously.
Check for a broken or disconnected duct Check the operation of the vacuum acutated motors under the dash Check the operation of the selector switch
Plugged evaporator? Check for a vacuum leak either under the hood or under the dash Check the operation of the vacuum actuators under the dash Check the operation of the selector switch
To engage the wheel for 4x4 operation, the selector should be set to the "Lock" position.j3h.
Check for vacuum leak either under hood or under dash Check the operation of the vacuum operated actuators under dash Check the operation of the selector switch
Check for a broken or disconnected duct Check the operation of the vacuum actuated motors under dash Check the operation of the selector switch
The selector mechanism needs repair or the doors inside the vent are jammed.
datasheet selector
Check for a vacuum leak either under the hood or under the dash Check the operation of the vacuum actuated motors under the dash Check the operation of the selector switch
Check for a vacuum leak either under the hood or under dash Check the operation of the vacuum actuated motors under dash Check the operation of the selector switch
Check to see if the brake lights are working - shift interlock is the same circuit Check the fuse Turn key to 1st position (unlock) move selector to neutral to start and then you should be able to shift to Drive