Regardless of whether you have the long output shaft from a 2WD application or the truncated length of the 4x4 application shown in shaft C above, if the governor gear is present, the outer diameter is 1.42 and you need the 4L60-002 Reluctor Ring that fits over it. Speed changes cause the movement of weights from centrifugal force in the governor that instigate gear shifts via a cable. The governor gear drives the mechanical transmission governor that predates VSSs. Some output shafts (from cars with R700 non-electronic transmissions and most aftermarket transfer case adaptor and output shafts) include the governor gear shown on shafts A and C above. WHICH SIZE RELUCTOR RING DO YOU NEED? Take a look at Figure 1 below. The rotational speed indicated by those pulses allows the Engine Control Module (ECM) to control shift points, idle speed, air/fuel ratio, anti-lock brakes, and other stuff. How do Reluctor Rings fit in? Each of the 40 nubs of either size of our 4L60-E reluctor rings emits a magnetic pulse picked up by the nearby speed sensor (creating more pulses per second as the shaft the ring is on rotates faster). Download our free book excerpt on Vehicle Speed Sensors for the big VSS picture. Without the correct Vehicle Speed Sensor (VSS) and Reluctor Ring, the fuel-injected TPI or TBI engine with electronic transmission that you install in your swap will run poorly and will not pass a smog test.
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