Tri -Ax Thready size

So a few days ago i picked up the Hurst T- Handle Shifter. i attempted to put it on and it jsut wouldnt slide on right. the thread size on the Hurst T-Handle is 1/2" by 20. i was wondering if the steeda handle is the same? or Hurst just put crappy threads on the shifter?

edit-Blah i didn;t mean to put that y on thread