I have a 2006 Dakota - 6cyl - manual trans with 106,000 miles on it. I bought it new. Never had any issues!!! Was taking it last week to have its first tune up (really). Speedometer stuck on the way. The code check said it was the speed sensor. After the tune up it ran like new. We replaced the speed sensor but it did not fix the speedometer. We pulled off the differential cover and found only 2 ring bolts in place, 2 bolt heads (perfect condition) sitting in a pile of metal sludge, and all the teeth gone from the ring gear hence the speedometer not working. There had never been any issues or rear end problems ever!
First: It is obvious this did not just happen!
Second: Is it possible this was a factory condition - not torqued properly?
Third: I can not afford to rebuild it - $2700 Quote. Going to use a used differential (not my first choice).
Fourth: Has anyone seen this condition before who can enlighten me on how this could happen?

 

Welcome to DF! Check out the 3rd gen Dakota section. They will able to help you out.

 

Thank you very much. I have started a thread in 3rd Generation Dakota's.