i bet you have the reverse fork off. pull the top cover and take a look. I made the same mistake. but I only had reverse missing. also, i remember marlin saying something about if the transmission is dropped on its bellhousing, and its not in first or reverse(don't remember which) when it happens, the gears bind up and the only way to bix it is to pop the cover off and shift it back to where it needs to be.
