I bought an all wheel drive kit today, and when i got home i noticed that one of the gears that goes on the shaft was melted slightly enough that it wouldnt lock up and just grinded. So if any of u buy upgrades from radio shack give them a close look before u buy to make sure they are fully intact and will be funtional. U dont want some fudged up plastic. The quality of the rs upgrades arnt that great anyways. Just thought Ide let everyone kno. so beeee awaaaare