Before i purchased the hv maxx i called novak, they recomended that i change the spur gear and slipper set up to the robinson racing slipper clutch kit (72 tooth double disc). i still had to run it a little tight, but i think thats becuase of the monster size tires we put on. After fine tuning the robinson clutch. my only problem was the stock diffs lol. I went with MIP CVDS center and axle kit.(a little more money but everyone around here says they are worth it). I still have a lot to learn about the R\C hobby, but Im hooked for good. Thanks,

P.S. They are out of the idlers but im on the e mail list when they get some in lol.