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4 channel had reluctor rings pressed on to the axles where two sensors are afixed to the backing plates and run off the reluctor rings.
3 channel has one ring on the posi unit and a hole drilled in the top of the pumpkin where one sensor runs off the reluctor ring on the posi
For quick refference any car with TCS (traction Control System) that little button on your dash board for tracton control... thats automaticly a 4 channel
No TCS = 3 channel
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