Dodge Repair Questions? Ask a Mechanic for Answers ASAP
The speed limiter is programmed into your vehicle's computer. The only way to remove the speed limiter is with a compatible scan tool that can access the programming. Most scan tools won't do this, so you will either have to buy a specialized performance programmer or take the truck to a shop that specializes in programming. Most 4x4 or vehicle customization shops will have this ability.
Superchips makes a good programmer that you can buy and do it yourself, but you will have to make sure the model you buy will remove the speed limiter. Not all of them do, and the one that will usually runs around $400-$500. It would probably be cheaper to have a shop program it for you.