Look at where the drive shaft meets the trans. I'm unfamilier with the VX. If it's 4 wd there wiil be a shaft to the front and rear. 2wd just a shaft to the back. The driveshafts are called dogbones and fit into "cups". The cups are held onto the transmission and differential shafts with allen or "grub" screws. It sounds like yours fell out or are loose. The rear screw is under the brake assembly. This has been covered before here on the forum. Don't get frustrated! These machines need constant care and maintenece. This applies to ALL nitro cars. You'll need to work on it yourself and not run to the hobbyshop all the time. You will learn alot about mechanics and physics hands on with these cars. When you run into problems look for the easy stuff first. Think it through. They don't work by magic or alien motivation. Take your time and relax. [8D]