a week ago i had a check engine light on and my speedometer stopped working, a friend of mine got the obII codes and said that it was the speed sensor mounted inside the automatic transmision. im still looking whitout succes for the part. any advice ??

96 t100 v6 4wd xttracab

I'm guessing the two problems are not related. The speedometer is connected to the transmission via a cable this spins. So if the speedo quit working, the cable/gears are broken or disconnected. The only speed sensor that I know of is related to the ABS.

but even the hanes auto repair manual shows a speed sensor mounted in the transfer assembly. getting confused <img src="/forums/images/graemlins/scared.gif" alt="" />

Look underneath.

You should see a regular style speedometer cable coming out of the passenger's side of the transfer case. The cable snakes up the passenger side of the transmission tunnel. There are also a few switches. They look like reverse light switches that come on manual transmissions.

There IS an electronic speed sender but it is in the speedometer. It's driven by the speedometer cable and the signal goes to the ECU, cruise, ABS, etc.

If your speedometer and odometer are not working then the cable's broken.

The Haynes manual is better for cleaning up in the bathroom than anything else.

then is it as easy as a cable replacement?

Biggest pain in cable replacement is feeding it through the firewall.