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Re: Service 4WD light on when AUTO 4WD pressed but works?
The only way to test or check or diagnose it is with the proper scan tool.
If there is a problem it will set a code.
Also a scan tool have several shifting test and live data in it.
Without a scan tool all you can do is throw parts at it.
But if that is your only problem you have on shifting I would just slow down or stop before making shifts.
MT
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Remember proper testing gives us the answer to many problems.
MT
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