hi,i was out with my km baja yesterday and after spending a load of money on getting it looking just the way i want it i have hit another problem,the thing is i need advice on what it might be,the buggy was going fine i was popping a few wheelies and then i lost drive i could still rev it and i looked down at the back wheels while reving it and one of the drive shafts was turning but the other one was not i lifted the back wheels off the ground while reving it and one wheel was turning but not the other, am i right by saying this is a differential problem or could it be something else?