never had a sealed diff. open gear diffs i pack with Mobil synthetic gear grease i get from work. ball diffs i use the AE's white i think it's lithium grease on the balls and rings and AE's black grease on the thrust.
use AE's black grease on CVD's.
shocks iv built up quite a selection of AE silicone shock oil. used to occasionally use Losi. nothing wrong with it, but there is apparently a difference between AE 30 weight and Losi 30 weight, damned if i could tell, but in the name of consistency i stick with AE.
for bearings i just use 3 in One oil.
and iv been known to use various dry graphite powders on hinge pins/suspension arms over the years. stopped using it about 10 years ago when i ran out. don't really see the need anymore. i also used to polish my hinge pins with Turtle Wax chrome polish. but haven't done that in forever ether...
and to clean all that slippery up, carburetor cleaner or brakleen.