Volcano was running great... and then nothing it will sit there and run all day long but does not move, im am think something is wrong with the clutch bell or diff..s what do yall think

i used to be really big on this site but with work and other stuff going on haven't had the time to get back into the rc world.. we have about 3 to 4 foot of snow on the ground now and ready to try my volcano out on some sick jumps... and anyone around the Pittsburg area.. thats Pennslyvania area