Ok so I finally got my parts from HPI here to Afghanistan. I instll the speed controller and run a pack though it without any problems, and the truck performed great! Well the 2nd pack I was driving along and it started slipping. No grinding or anything just slipping. My guess is the slipper clutch needs adjusting. Any other ideas? Its looks to be kind of a pain to get to. Has anyone done this on an XS Flux? Thanks!