Speedometer does't work,replaced sensor and is plugged in.

You replaced what speed sensor ? Do you mean the VSS - vehicle speed sensor ? Wheel speed sensors for the ABS - anti-lock brakes system are sometimes used for the speedometer info on some vehicle makes , but not yours . Where on the vehicle did you replace the speed sensor ? Could be the speedometer is bad .

dude your tranny sounds like its shot

its located on transfer case rear end near propeller shaft , have 3 wires plug

Your speedometer cable is broken. all you need to do is replace it.

you didn't state year or model but you said you replaced wheel speed sensor which is not correct the wheel speed sensors are for the antilock brakes and traction control

Your problem is with the vehicle speed sensor that on the transmission not on the wheels
or you might have a bad speedometer it self does the odometer work ? if the odometer works more than likely your problem is with the speedometer it self and not the speed sensor

I'm not sure with that type of vehicle, but on my 91 S10 my speedometer did not work at all also. The problem with that was the sensor that plugged into my tranny was missing so it was not reading anything. If you have a sensor that goes into the tranny it may be bad or missing so in my opinoin i would try checking that.

if I remember correctly, the speed sensor plugs into the trans and there were some concerns with the gear in the trans

simple test, with the engine running, have someone watch your speedometer while you hold the sensor in your hand, plugged in and spin the gear. If the speedometer works then suspect the trans gear

Modern cars no longer use a mechanical cable and speedometer. They have an electronic sensor called the vehicle speed sensor (VSS) which is mounted to the transmission where the old speedometer cable used to go. If the engine was replaced, perhaps the mechanic forgot to plug the wiring harness back into the VSS? Or perhaps he damaged the wiring or the sensor during the engine overhaul. (The transmission has to be removed to remove the engine from the car.)
Charlie

you dont say what the part is that you replaced!
So ill assume its the speedo sensor it may be the drive gear that drives the sensor worn out or sensor not aligned with its drive when replaced

The sensor for the speedometer is in the tailshaft of the transmission its called a vss vehicle speed sensor,all you have to do is unplug the plug and unthread it and replace.