I've been looking into this also. This sight shows the tool you need to hold the nuts
in place. I have no idea where to get it. Maybe the dealer. Looks like it is a pain in the
ass to get the proper torque when reinstalling also. You figure anything out let me know. I'm getting close to 100k and want to redo the fan clutch, water pump, thermostat, and radiator.
Pelican parts talks about this tool also. No one says where to get it.