So I bought my 7 year old son a captain's curse about 2 months ago. (ok, ok it was for both of us!) I just upgraded to the vxl with the 3500. Now the truck is crazy fast. We use it pretty much only off road (dirt, fields, bashing, etc). Currently on stock tires, but that may change. I was just wondering if anyone had some good suggestions for gearing - pinion/spur - that works best for this type of play.