Originally Posted by Granpa

Check with TQ racing. Also the Hpi pinion is okay, but do prefer the Robinson pinion over the Hpi. Bensi Lopez the 2012 TCS Champ ran the Hpi pinion which used to be available at TQ.nStill think the Tamiya one is the best if you can find it.

I ran both the Hpi and the Robinson for while. I purchased the Robinson from Tower Hobbies cause that's the only place that was convenient .