Hi, just wondering if anyone knows the answer to two problems that my different RC Cars are having. The first is the rear wheels of my RC Car are stopping and starting really quick when I drive but the front wheels are running perfectly fine. They also shake around a lot. The second problem is my RC Car is when I turn it on, its fine but as soon as I turn either way, it starts making a really loud noise and your cant turn anymore. Please help!

Also, if anyone know where to find a rear tail shaft replacement for a WPL C24-1 , that'd really help! Cheers!