Looking for some advice. I got a parts truck recently hoping to use the engine and trans. Engine runs great. Trans has issues. In my specific case when I start it up it seems to be in park. I try shifting to other gears and have a total of 7 neutrals. It does not drive in any gear plus the park pawl is not engaging. I forgot to pull it into neutral when I pushed it by hand and discovered park did not work. What could be any possible cause for these issues? I have no problem rebuilding the Trans if need be. Just need to know what I'm looking for.