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Originally Posted by herkyhawki
We need a technical 4x4 explanation. My guess is that the encoder motor moves a shift mechanism,which trips the vac switch to send vacuum to actator which then pulls cable to engage front axle. I'd appreciate if someone can do a write up on this. What voltages should you see at the encoder motor? how to test the encoder motor? what sensors are there to sense if it is in 2wd or 4wd. Is there a sensor to confirm front axle engagement? How to troubleshoot front hub engagement.
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Heres the best web page that I've seen on that subject
http://www.4x4posi-lok.com/PDFs/TSG_chevyT.pdf