Check the grub screws on the output yokes that exit the transmission, they might be loose, if they are put some blue lock tight on them. Also thighten your slipper if it is to loose the truck will not move. Try these things and you find the promblem sooner or later. You have to work on these things all the time, it will get easier once you learn some things. It is all about maintance. Go to savage -central.com and do a lot of reading. These things are not that hard once you learn the basic things you need to know. It takes time. If you dont have time or to lazy to work on your truck then you might wont to try another hobby, like rock collecting I enjoy working on my savage, just as much as I like running it