I just bought a 1999 chevy astro van AWD
i am not mechanic but realise logic control senses excessive rear wheel spin and transfers some torque to front wheels. try quick take off on gravel road to see which wheels dig in or have friend spot if front wheels are driving when they should be. could be simple corrosian at wiring harness. unplug and spray with contact cleaner and re connect and re try. this wont cost you anything.
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