I have a th400 turbo automatic transmission which won't shift into park. What could be wrong with it?

Question

How much would it cost me to replace/repair it? And how hard it will be to fix it by myself if possible? The tranny is in a 69 chevy truck and has a b&m shift kit. It is also rebuild.

Answer 1

i would start with a linkage adjustment. it is the easiest adn cheapest thing to do.  

Answer 2

The cable needs to be adjusted.First look for loose brackets an bolts.adjusting nuts.

Answer 3

Could possibly be the parking pawl, Rebuilt? By a professional? Better get it checked by a professional?