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This is the speed sensor, correct? http://www.marlincrawler.com/transfer-case/parts-upgrade/vehicle-speed-sensor-oem

This is what I am questioning the integrity of right now.

Edit 2... senility is setting in.

What part of the OEM piece does Marlin's VSS replace?


Yep, that is the sensor, gear on the end of the shaft. I think Marlin's part is intended to replace the stock part (if it is bad) or add the VSS like when you put a daul t-case on a newer vehicle (w/ electronic speedo) and the old case was set up for the cable driven speedo.