I have no codes no check engine light or ABS.Truck runs perfect shifts fine problem speedometer is at 90 and works from there reset the ECM this weekend zeroed out then went back to 90 when I started driving it around?
Speed sensor in the rear end or something else.

 

I got the same issue with my 05 but mine starts at 70. You ever figure out a solution.

 

I would definately take a look at the sensor in the rear chunk. Mine started going bad and it would bounce while I was idling.

 

Did that end up fixing your prob? I will take a look at it. Was there any noticable damage to your sensor? What side of the rear end is it on? I am sure I can find it but figured I would ask anyways. Thanks for the help man

 

No visible damage. Its on the top i believe. I think when my dog got a wild hair in his *** and decided to chew my wiring harness it shorted it out.