Join Date: Jan 2009
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I would put money on it being 1 of 2 things, because the speedo doesn't register, that gives us a big clue. It is either the Tone ring in the rear differential, or the sensor that mounts in the rear diff and reads the tone ring. They work as a pair to read vehicle speed and control the ABS. If you pop your rear differential cover and take a look at the tone ring (sorry I don't have a pic. It is a large ring with small teeth along the outside, bolted to your ring gear in your differential. If the teeth are chipped or damaged on the tone ring, that will result in the problem you are having. The next possibility is that the sensor is bad. This sensor plugs in on top of the diff. and reads the tone ring, I don't know the cost off the top of my head, or if it can be tested, but you might want to call your local auto parts store they can probably help you out with this.
2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.
TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)