I don't know anything about the LT-1 4L60E tranny's. I know the later ones use a electric signal for the speedometer. Cable X makes a box that converts the electric signal to drive a cable to utilize the original speedo. If your tranny is cable driven I'm not sure what exactly your needing. Cable X website is here, I'm not sure it will work with a stock speedo but will work with mechanical Autometer and Stewart-Warner brands. If nothing else a TTT for you.
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'68 Short Step
LS1/T56, Hydratech, Fatman Fabrications Stage III, Baer, Hot Rods to Hell, US Body, S&W, etc
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