you blew the servo gears apart.
find one of the other threads on here reagrding servo issues with the mlst line of trucks. there you will find good information on how to fix it.

of and SAm... your truck is the same thing as the mlst, mlst2 and the mini monster baja. the ONLY difference between yours and the ones I mentioned is you started out with one brushed motor and all these started out with two. the frames, servos, diff's etc are all the same.

Look in the other threads before starting a new one.