Originally Posted by Thopper
Yes ,8th scale mbx6. What are the rcpd innstructions? Are they rc8 specific?
They are special for the RC8 using a Kyosho plastic spur gear. You could apply the principle to other cars if you feel that the diff has a lot of slop on the spider gears. Bascially it adds additional shimming washers to the spider gear assembly to get a tighter mesh. This has to be done on the RC8 with the kyosho spur because of physical differences between the kyosho spur and the AE spur. You could just try adding shims to different areas and see what happens to the action of the diff. If you add shims and it doesn't bind up, the diff probably needed them. If instead you add shims and the diff gets grindy or tends to bind then it probably didn't need them.