i took my 37's off n put on my stock rims n tires then took my bdtd n changed tire size back to stock and now its dead..cant get a reading at all..i tried returning the tune to stock and still nothin, then reloading the adjustable tune still nothin..it has a abs n check engine light but no codes..HELP please..i have a 3000mi trip to go on tomorrow

 

There is a sensor in the rear end of the 2nd gen trucks that controls both abs and speedo.

 

ya but what didnt make sense to me is that it workd until i tried to change it back to stock..then nothin right after