Thanks for this thread. Doing hub rebuild and searching endlessly for proper grease type/amount for new 100 Series style spindle bearings for my 80 Series, as I am replacing the entire spindle and this is how they come new (and not looking to replace with old style, but you can).
Mud and Youtube are all over the place on this newer 100 Series spindle design, with some saying no grease vs. heavy grease, red high temp vs. only moly and NLGI 1 vs. NLGI 2. So, I went to the 100 Series FSM and this clearly says NLGI 1 (see pic) but it also looks like the new IFS design added an oil seal behind the spindle, as this is now a sealed space with no knuckle ball/CV housing.
That would explain the recommended use of NGLI 1 grease in the FSM because there is no risk of this thinner grease mixing w/ knuckle moly as it would in the solid axle 80 design, which was my concern. Especially a concern if you plan to maintain with adding more grease at future intervals using the aftermarket spindle grease tool, as you would be pushing old grease from the spindle into the knuckle/CV space.
The new design needle bearings may not have been intended as a complete retrofit for the 80, and perhaps we are supposed to pop them out in exchange for the old style full brass bushing afterall. But to me, use of moly NLGI 2 (same as knuckle) probably makes most sense because they will naturally mix over time, despite not being optimal for the needle bearings from what I can gather. Given these are not under load, however, it may not matter much and any grease is better than too little (on none!).
So, moly grease it is!!!