The 19t pinion is already out if this is what you mean. I am using a 18t right now. It is not a long shank pinion as I don't have any and would rather use all the one's I have. I am using the revo style 2 piece shoe clucth setup. It is just the center shaft part only that is used. It acts like an extension and it fits perfectly. I just filled a flat spot on the end where the clutch bell would go and used a regular pinion instead. Works really well and I can use any pinions I want. I will be bumping it up to a 20t now. It was real slow on 4s and it drives like a tank. It seems kinda heavy to me. I guess I'm not used to it yet.

19T Long Shank Pinion
http://www.teknorc.com/product_info....oducts_id=1122
Revo Style Clutch
http://www.amainhobbies.com/product_...rce=google_ext