Kyosho ST-RR conversion

[Shark413]

George16, I am running 7K, 10K, 3K in my diffs and that setup works well for the short technical track I run at. One thing you have to keep an eye on are your diffs, the ST-RR uses spiral gears and they are very sensitive to shimming. The torque, heavy truck, bigger tire contact patch, plus the fact the neu motor puts out so much torque it can shred diffs bigtime. I destroyed my center diff one week and then the front blew the next week. The center blew out because I switched to an aluminum diff cup that was a little out of spec, the front blew out because the inner pinion bearing let loose throwing the mesh off. I have switched back to the stock Kyosho diff cup for the center with harden HB gears and rebuilt and reshimmed the front diff (and replaced all the bearings). Don't get me wrong, the ST-RR is a durable truck, I have been running it hard for 5+ months and these are the first diffs I have blown. Nothing else major has broken, but I did wear out the front bearing in my Neu a few months ago (replaced by Neu).