Just finished building mine all that is left to do is paint the body and glue the tires. The only question is about the diff the instructions are clear as mud, as how much grease to put in, I put in a light coating on all of the gears and assembled it. It feels smooth but I don't want to trash it if its wrong. can anyone tell me if that is correct. Can't wait to race it and see how it handles. Thanks for the help in advance.