I have a 2000 pontiac montana. I never had a tranmission problem with it but just the other day I was at a traffic light and the car just stopped moving. It went into the gears no problem but it wouldn't move regardless of what gear it was in. I dout its the transmission becuz in my experience the car usually starts giving u signs that the transmission is going it doesn't just stop working out of the blue. So what do u think it could be. One guy told me it might be the sending unit on the transmission. So u think u can point me I the right direction?