When the car is going 50 the speedometer is showing 85. It is a 92 lumina sedan.I know it has a sensor on the right axel housing , but is the trouble in the sensor or the pcm.?

have you changed the transmission or guage cluster prior to the speedo reading way off?

No I have not changed anything, also the cruise does not work. The hand moves smooth but shows to fast . Can the sensor be dirty and getting the wrong signal?

Hey whats going on ?I don't seem to be getting any help.

has the speedo always been off, or did this recently happen?

I had this problem when I got the car. It has the right size tires ,so what is going on? It has the sensor with 4 bolts instead of the one bolt hold down type. I checked the wiring .it seem ok. the speedometer goes back to 0 when I stop. Works smooth does not jerk or anything.

Alright were is all the answers to my problem with my speedometer? I know there is somebody out there with this problem.

I would pull the cluster and see if the sticker on the back matches the vin on the car. It sounds like the cluster was swapped with one from a different year and it's calibrated differently.