OK i think that I have found a big issue that isn't helping, after the first race where i striped the spear gear, i changed it over and notice that my front diff was very loose and my rear was very hard. This was so bad that I could hold both my front wheels and the read would still go with very little effet.
In the last race it was very bad, coming out of a corner i would give it a little power and it would dig in and spin out.
Any ideas, i'm going to have to rebuild the diff and see how i go.
MDL