no no, i think you do have a valid point. make sure you brake clean off your gears (not bearings) before you put them in, then oil. you really don't want to have any dirt in there. i mean, i personally would be really skeptical of brake clean on certain things, but i watched a master tech at work the other day rebuild a tranny, he soaked everything in it, then made sure it was all lubed up and spinning properly before he sealed the casing.