cantgetright

I just recently bought this 2000 GT. When I got it I noticed thid gear grinding in high rmps & sometimes second. Then I notice a slite grinding at low rpms in 1st. Well after further investigation my input shaft seal was leaking so I repleaced the clutch, pressure plate, release bearing " A little worn nothing serious " , pilot bearing " witch was shreded ", light wieght flywheel, starter "bindex was hanging up a lil ". As far as the Trans goes I had synchros&bearing put in Now I got the trans in etc and it wont go in gear. Really NEED SOME INPUT HERE. I thought I did it all the right way & now I'm just stuck. also all new seals