SI2SLOW

I have 2000 si with fully built motor and sc61. Car put down 312fwhp at 12 pounds of boost. Have not driven the car at all since got it dynoed. Its not even registered cause i don't have the time to drive it. Therefore decided to sell it and put it on autotrader for 12500. Remember the motor and the turbo has maybe 20 to 30 miles on it. Long story short I took it out for a drive around the block today to make sure everything was running right. Everything was perfect. Pulled up to my driveway after taking it up to maybe 5500 rpms. stoped to check for leaks or anything else. Had a small leak(drop every 10 sec.) from the diver side axle. It allway had that because the stahe three axles just wouldn't sit right. long story short, got back in the car to park it back in the garage and nothing. I put it first and it doen't engage. none of the gear engage. what did I do? I am not that great at fixing cars and the friends that use to help me has moved. So i think I may have to part it out and try to make about 10 grand out of it. or see if someone will buy the whole thing for 10k. What do u guys think I should do. sorry for the long post.