Navigation system

[cdrracing]

Does any one know if it is possible to add a navigation system later?
I will be buying the truck some time this week and I don't know that I can afford the navigation system right now (even though I want it soooo bad), and so I was wondering if it is possible to add on later (from a wrecked truck or something), or is the wiring different from the factory on a standard radio vs. the nav. radio?
It's a difference in price of almost $2K.

[4x4ord]

I am almost certain you can add a built in (which looks factory) Pioneer at a later date. Might cost just about as much unless you can jnstall it your self.