Burnt Spur/Slipper Replacement Question

[sracingcells]

I just went for the first run with my new feiago 8L and 9918 in e-maxx. It was making a squealing noise so i pulled it over and the spur gear was smoking! It has a hole burnt through it where the slipper is. I had it all the way tightened down(is that ok?)
So what I was wondering is what a good replacement would be for the spur gear and slipper. Should I get the dual disc slipper from robinson racing?
http://www2.towerhobbies.com/cgi-bin...?&I=LXBJB5&P=7

and what is this mod 1 pinion thing I hear about?
Thanks