RogersRacing, I think you will be good. A lot of people put the fuel line in the diff cups to snug it all up. It will wear out, but works good while it's in there. For the mesh, I use a piece of typing paper folded in half. Push the gears together and align the motor good. Tighten it all up and you should be able to pull the paper out without ripping it. It will look wrinkled from the gears with no tears. Turn the spur gear over a couple times to make sure it turns freely all the way around.

Also, if you have not done the diff cup mod, you might want to check it out. It extends the life of your diff cups a lot.