Stock radio question
 

Will the stock Radio still work even if the artard who owned the truck before me put in a new sony radio, cause he did something with the wires.

Hard to say without knowing what he did exactly with the wiring. Is the factory plug still in there? Most use the adapter that simply plugs into the factory plug if that's the case the stock radio should plug right back in.

I thinks thats what he did, and i'm really hoping, cause i don't want to spend like 70-130$ on a re-manufactured radio that wont even plug back in.

It's very easy to pop the aftermarket radio out and see if the plug is still there. If not just put another aftermarket in there.