today i looked under the bottom of my tsunami truggy and i noticed those two black gears are a little loose , how do i snug tighter ? i was told this is common to come from the factory a little loose ........what tool will i need ?

if you mean the spur gears, the smaller of the 2 is always a little loose, the bigger one should be pretty snug. if you think they are super loose, you need to take the trans out and take it apart, dont worry about a little play though.