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4x4 won't shift into four-wheel drive



I have a 2000, Silverado 1500 4x4 that wont shift into four-wheel drive.

I have changed the encoder motor (used), the front axle actuator (new) and electronic shift switch (used). The shift switch tells me its in either four-hi or automatic four-wheel, but the truck is actually in two-wheel drive.

hWen I depress the 2-hi button, the light flashes, a sound comes from the encoder, then the light returns to 4-hi. It's the same when I depress the 4-low button - its flashes for a few seconds, doesn't do anything, then lights up in 4-hi (even though it is in two-wheel drive).

Help please.



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