The sensors are in the axle housing ends. They need to be removed to get the axle shafts out - at least that was what Spazz told me. So we did remove them successfully. I don't remember exactly why they needed to be pulled though.
The axle shafts won't pull out with the sensors in place...I'VE TRIED...
Then buttoned everything back up, went to Moab, & had fun anyway...