I have a 2 yr old ARRMA Outcast, its ran for 2 summers about 9-10 months,,the last month of this year before I put it up for the winter it will NOT get wheelies anymore,,its just as fast , I rebuilt the differential earlier in the summer and it was fine,,my batteries take a full charge, it WILL get a wheelie for a short distance in the grass but on the pavement it only comes off the ground maybe 2-3 inches when it used to get a wheelie all the way down the rd,,i talked to Tower the guy gave me his OPINION , but still not sure Anybody have any ideas THX !!