What does the speedometer cable need to work properly in a 1978 Oldsmobile cutlass supreme 350 hydramatic transmission Fluid is leaking where the cable goes into the transmission?

For the speedometer cable to work properly in a 1978 Oldsmobile Cutlass Supreme with a 350 Hydramatic transmission, it requires a secure connection to the transmission and must be adequately lubricated. If fluid is leaking where the cable enters the transmission, it may indicate a worn or damaged seal, which could lead to inaccurate speed readings and potential damage to the cable. Addressing the leak by replacing the seal and ensuring the cable is properly installed can restore functionality. Regular maintenance of the cable and surrounding components is also essential to prevent future issues.