1991 Other Mitsubishi Models cv's

I Live In Georgia i have a Mt. 3000gt / stealth 5 speed! I am looking for a 25 spline Jack shaft? I can't seem to get anybody to understand this Part! Am I Calling the part that is a shaft that is between the transmission and the Cv?if not can you Please tellme the correct name and Maybe a Place to Lcate new or used? This is the last Part i need to Complete? HHHEEEELLLLPPPP!!!!!
Thankyou Robby!!