I built my first one last night. It was actually it ws easier than I thought. I have to get a pack of the washers to shim some more. The LHS didnt have them on Friday. I have one on each side and still have a little play. I think one more on each side will do it. The part # for the washers are
Traxxas 3981. Then I will just need to open the diff cup back up and shoot some grease in there and I should be done. Then just use my drill to break them in.
Thanks