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Re: '97 Explorer 4x4 problem, ate front diff.
The speed sensor detects slip at rear then the computer commands a pulse width modulated solenoid to engage the front axle as per rear slip.The more slip at rear, the more engine power is directed to the front diff. And visea versa. There should be a code for either a front or rear speed sensor. You can Ohm them but that isnt much of a test. You need to see the frequency of the AC(like with a fluke 88) Maybe don't worry about the motor for now(unless its stuck in 4WD HI or LOW) Figure out what sensor is defective. It seems the switch would have to be in 4HI to destroy the front diff, hmmm...
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