Ok, I have an 83 Trans am 305 FI engine with Cruise control. I'm pretty sure i need a replacement lower speedometer cable. Searching on Advance Auto and other sites, i find the same cable (as an exact fit) that has a square shaped inner drive cable. The problem with this is the cable i removed from the lower cable connection point on the transducer has a blue colored spiral gear at the end of the inner drive cable. I cannot find this exact cable anywhere. will the square one referenced above still work? Bottom line is speedo is not working. I have verified speedo, upper cable and transducer ( i can manually spin the lower transducer input and get a response in the speedometer, lower cable spins when in gear but i'm guessing is worn and not meeting properly with transducer input)



Existing lower speedo cable connector at transducer



new upper speedo cable with square inner drive



New transducer

 

Looks more like squared end got twisted, the square plastic end gets worn out over time and or something locks up in whole system. Did the old transducer lockup? A regular replacement cable should still work and fit into transducer.
Joe