Hurst shifter for 4l60e???
 

I bought a hurst promatic 2 shifter for my 2000 trans am. I got it all installed but when I'm driving it don't want to shift.?? But when u let out of the throttle it will shift. An hammering into it she reves up to the rev limiter before she down shifts. It's never done this before, an I didn't hook up the other tow linkages that where installed to the stock shifter. What can I do to get it to stop an work properly? Or is there anything I can do?

make sure the shifter is adjusted properly

The Sensors an other stuff that was on the stock shifter wouldn't have anything to do with it doing what it is now??