The speedometer quit working how do I fix it?

The odometer quits working when the speedometer quits working. The most common cause for the speedometer to quit working is the speed sensor in the transmission. You said you replaced it, there is also a transmission speed sensor on your truck that may need to be replaced. I understand your frustration, but there is nothing else that would cause the speedometer to quit except the cable behind the gauges being clogged.

There is a speed sensor on the rear diff cover that may me shot, however it is regulated by hertz so the dealer is the best place to see if the wires are okay. That sensor can be costly.

This is pretty common on the 2005 Mustangs, it's caused by failing stepper motors in the instrument cluster, they control the movement of the gauges. Repair is around $180 and there's a guide on how to fix them yourself here - 2005 Mustang speedometer problem

when the sensor was installed it was installed wrong.
They wired it into the turn signal feed.
have your dealer or, an auto electrician fix the wiring to your sensor.

this car uses an electronic speedo head, u must rmove the speedometer from the dash and send it in for repair at an authorized ford electronics repair center.

Your speedometer is fully electric and the sensor at the transmission side is not sending pulse to the computer ECU.

The part is call Vehicle Speed Sensor (VSS).

There are two versions.

16 bolts and 17 bolts transmission pan version.


Count the number of bolts on your transmission pan before you head for the part store.


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Thanks

MUSTGO.

Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Impala instrument cluster repair

I installed and after market stereo and my speedometer quit working 1999 chevy s10 blazer

it's in a heat protective insulating bag with a snap button on top of the differential housing.

most of the time its the vehicle speed sensor or vss. it located on the trans . its about a $140 gm part