Thank you cousingrandpa. I will have to look on the hpi site again for the ball diff. I am known to look straight at something and not see it. As for the overdrive pinion gears, I've
tried RPM, Lunsford, HG and Robinson, and cannot find pinion gears for the overdrive st. keep in mind I may have already looked at them 3 or 4 times might you be able to suggest some other company's to try. It is possible I did not get the mesh set right, I set it as tight as I could get it without binding. Thanks again $ircra$halot Garry