grease

So I blew out both the diffs in my Temper thanks to a new motor. I ordered a couple of solid aluminum ones and installed them over the weekend. When I opened up the packages I realized the screws weren't even tightened all the way so I disassembled them and put some Loctite on the screws. I...

should I grease my metal piñon and spur gears. If so what type of grease

I installed the ECX metal transmission gear set yesterday. I did not lube the gears, as the stock ones looked dry. Should I have added some?