I have LB and asked all the stores in KW street; the upgrade set is about $250 + waiting. add another $100, you will get a new LB. forget it.... Play as it is...
I put an O-ring to make the front shock shorter, so not as bad. How old is your daughter? My 4yr old son has been driving my Lunchbox, and I drive a RC10B4 to play with him.