Q: My 4x4 system stopped working.

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My 4x4 system stopped working. I have had it in a shop for a few weeks but still nothing. I have replaced the motor on the transfer case, the control switch, fuses, relays, and the gem module. I can't afford to pay for the mechanics to keep trying this and that. What could it be and how do I correct it ?

My car has 160000 miles.
My car has an automatic transmission.

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