Air gap 0.010" to 0.015" at tightest point. I've found at 0.010" (book spec) I get a little rub so I normally set at 0.015". If you are over 0.040" mag coil will not work properly.
Torque gap will be based on your GVW. (Truck weight+max batt+ cap load).
Sorry that air gap spec I gave you above was for SP3400 series. 3000 series book spec was 0.005"
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