I'm running a 14 tooth pinion and a 51 tooth spur on the 10XL on 18 cells at the moment. The controller gets pretty hot,only the 7020 though, shouldnt have any troubles with the 9920. I'm using some GP3300's right now, but once I finish off my center slipper setup I'm putting in my new 2240 14t on 10s lipoly in there. The lipolies I have are the Maxamps.com 4000 MAH car packs. The truck took a few minutes of jumping to get used to, but once I learned how to jump it, it flew really well, it has pretty even weight distribution, so it usually stays level when I jump it. Since that last update I have taken out reverse on the controller and everything is fine, it runs pretty quick and I'm getting about 20-25 minutes of runtime. If you're using a center diff, you shouldn't really need a slipper, if you want to use a center slipper like something I'm going to use, which is basically just a one gear tranny, you will have to put it together yourself or try the ofna dominator slipper.

I should have the new slipper setup in about a week. I'm currently upgrading the diffs to 6 gear spyders from UE, and after that the only thing I might ened to get is some of the heavy duty dogbones.