Did you hook up a professional scan tool , check sensor data to the PCM - engine computer ?
SOURCE: Speedometer runs erratic and transmissions drops to second gear.
The ECM or TCM may be the culprit, its also possible that a ground wire is no longer grounded or partially grounded giving you the erratic speedometer.
SOURCE: location of speed sensor on 2004 silverado automatic transmission
the speed sensor is located generally on the tailshaft housing or in other words where the driveshaft slides into transmission has a small black sensor with a couple of wires going to it. those trucks have a bad problem with the cluster going out on them though. more than likely that is going to be your problem. you have to take cluster to dealership (new one) and they have to burn the current mileage into it.
SOURCE: 1993 Chevy Silverado
Replace the vehicle speed sensor, it's located in the tailhousing of the transfercase
SOURCE: Instantanious ignition drop out
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SOURCE: Chev silverado 2000 speedometer and sterio deck not working
You probably blew a fuse and the other affected components are on the same fuse. Check the fuse blocks for any blown fuses and replace as necessary.
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