I put a transmission in 4l60e in. An im having problems.

What is your question?

I bought a tranny 4l60e 4.3 4x4, it came out of a 1999 blazer i hve a 01. heres the problem after i put it in when i went to start it as soon as i turned the key the truck started an i dnt hve it turned to the starting position also the startet stays engaged it only does this in park or reverse thats the first problem second is i assumed my leakage was off because the car wont go into park. Once i take it out it already had that problem with the old transmission it drove in neutral i thought wuth the new trans that would b fixed plz help im baffled here any advice would b appreciated.