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you may have enough cable to reach the 4l60 s speedo. if not have a new made with about 4 inches. gm used to sell an extension for the lower cable,check with your local chevy dealer.it is aprox 12 inches long and screws onto the end of the lower cable. pull the reluctor off of the output shaft before you install it in the car .how are you going to make it shift as it needs the speed sensor input to shift? i i havent seen any 40 pulse external speed sensors