Weakest parts on the FF are teh diff cups and spurs.

For the diff cups, there is a simple mod that solves all your problems http://www.rcuniverse.com/forum/m_42...tm.htm#4204407

search for "diff cup mod" and you'll find tons more threads on how to do it. Can be done with copper tubing, compression fittings, or anything really.

once you mod them, you'll never break another one.