IIRC 93 Chevy trucks with 700R4 had electronic vss. To retain the cable driven 69 speedo you'll have to install a speed sensor and cable drive. Jags that run has a sensor to do this, or search autozone for a vss for a 93 Caprice (autozone p/n SU1112). They both put out an ac signal so a DRAC would be needed also. The DRAC will convert the vss output into two square wave signals 2000 pulses per mile (PPM) for the PCM and 4000 PPM for the cruise control. Hope that helps some.