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After removing the 4L70E tailhousing, we have a reluctor on the tailshaft that needs to be removed. We used a thin cutoff wheel to notch it deeply on two sides, then tapped it lightly with a hammer. In its place is this unique SFS reluctor that retains the Vehicle Speed Sensor (VSS), since that is used as the primary feedback sensor to make shift decisions. Note how it also adds a traditional-style speedo gear.