Is it possible to make an automatic a manual transmission?

If not, how do I know if my car has a shift kit on it because in order for it to shift smooth, I have to do it myself starting from 1 and it doesn't shift to D4 (even if I put the shifter there) unless I'm over 50mph.
Unless my trans is taking a dump on me..
Little help over here?

 

Your cant turn an auto into a manual.
And your auto is probably going out.

 

Even if I swapped the auto trans for a manual?
And it shifts fine when I do it myself it doesn't keep slamming into gear. I understand what you're saying and I had that experience before with one of my previous cars. I don't think it's the same thing.

 

you can do an auto to manual swap.
your need everything from the manual tho.

 

pedal assembly
clutch master cylinder
trans
clutch/flywheel kit
shift linkage
ecu
trans mount

Unless the parts can be had for dirt cheap, its not worth the time, money, effort. Might as well start with a manual car.