I have my old dealer asking me about there cab-n-chaise not being able to go over 69 MPH? Does anyone know about this? I left the dealer to get into trucking and working on diesels here on the side. I left before the 6.7 came out and I'm not to much up on them as far as programs and all. The tech they have now is a Saturn tech and has no clue. I haven’t used a DRB III yet on them but wanted to see if anyone else knows about this and is there anything we can do to change the speed limit.