quick question,I'm going to be pulling my kids tranny apart here in a few so i thought id ask real quick,yesterday took my sons rtr sc10 to the park,its only been driven on the street so far with the throttle turned down,we took it to the park yesterday and i turned it up a little for him,he did two donuts and then the tranny starts clicking,its still got the black grease in the diff,I'm a ball diff guy and the gear diff is new,is this something that happens a lot or maybe just needs some oil in it? this truck has maybe 3 packs through it on the street and thats it,still brand new.