ok guys I did an impeller change on my motor and I went to zip it all back up to find it wouldnt shift into gear. everything is in the right place as far as i know. The impeller hose is hooked up the rod linkage was hooked up good. I noticed if a loosed up the lower unit to were there was a half inch gap it would shift fine but as soon as i tighten it up it will only go in forward and neutral. it wont shift all the way down now. It was fine before. what is going on?