I’m Trying to install my Gearvender overdrive. I’ll have to dig that piece out of my tranny housing, or find a new one!you will need to transfer it to the new cable end or the speedo cable wont work .
the part on the cable needs swapped over to the new cable . https://www.ebay.com/itm/GM-Cars-Sp...r-Plastic-Key-Female-GM-88961013/331379419165
as to the speedo drive i have no clue for the gear vendors unit requirements .