I have a 1999 gas EZ-GO. I'm not sure of the model #. When I put it away last Dec it ran fine. I tried to take it out this weekend. I was able to start it with no problem, but when I hit the gas the engine increased RPM but the cart did not move. I pulled up the seat and saw that the pulley and shaft on the differential were turning but the wheels did not. Conversely, when I turned the wheels the shaft and pulley did not turn. My question is did I break a sher pin or something. If so where is it, in the differential or the axel? Any ideas?