Abs speed sensor
 

I was driving down the highway today when all of a sudden my speedo stopped working went down to zero and the abs light and brake light came on , I'm thinking it's the abs speed sensor on the top off the rear diff does that sound about right ??

Yes. The lights are on indicating a code. Get it read to verify if you want.

Yup it's your speed sensor on rear diff. . $30 part and a 15 minute fix.

What year is your truck? It makes a difference.