We took the second stage out of the KOP transmissions, and have the bad GTS issue to deal with, and I found this sensor at digikey
http://rocky.digikey.com/scripts/Pro...102&M=AMT102-V
looks like it might fit right inside the transmission where the other gears used to be, and slip over the 8mm (5/16") shaft of the motor, and maybe even work, and for only $30 per side.
what do you think?