A couple of things to keep in mind. You are going to have to sell it private party meaning if the buyer doesn't have cash they will have to borrow money. It's a lot easier for a car lot to arrange financing than an individual. The interest on that type of loan is going to be higher than if they go to a lot and have good credit and most people consider what the payment will be not the price of the truck. The 6.0 truck isn't nearly as good as the older 7.3 trucks, they had a lot of engine issues with the 6.0. If it's never been in the shop for repairs then it doesn't have the upgraded head gaskets and studs. It sounds like that truck is a super cab not a crew cab and there's about 2K difference in price, of course the crew cab is worth more. As far as NADA price the trim level and options will make a huge difference in the truck's value. a XL without any options will be a lot less money than a King Ranch that's loaded up. On a new truck there can be an easy 10-15K difference in options. If it were me I would see what NADA says the truck is worth for a clean trade in but you need to take all the options and trim into account when you do. Then negotiate with the dealer, they always have room to improve a deal. The last thing to consider is this, the dealer has a better idea of what's moving and what it's worth. There might not be much to be made on it.