I think my boss will pay for replacing the head end unit & the price point is probably going to be around $ 200 or a little more .
I listen to AM , FM and audio book MP3 files . I would like to get a DVD / GPS . Looks like I am going to need a double DIN unit ?
I do not wish to watch DVD's , I want the greater storage of a DVD blank to burn a larger number of audio book files to one disk .
I also want the larger display to more easily see the screen .
I have searched EBay and googled for car DVD in dash units . I find a flood of brands I know nothing about . I am not an audio nut . Just want to listen to the AM / FM & audio books while I drive the long miles . I get less sleepy listening to a book .
Does what you want pretty much except for the GPS. GPS units that are worth a dang are going to be 500 and up. Buy a stand alone that you can update. I drive 50K+ miles a year and love my Garmin. There are others out there that are just as good.
Some double-DIN (4"-tall) radios will not fit your vehicle because the harness interferes with the dash substructure. Also does your truck have a Bose system? You might need to get a GM Factory Integration Adapter. Never heard of an ISO port. Most aftermarket radios just have the wires loose and not in a connector. That way you just buy the wring harness for your vehicle splice it onto the radio wires.
"Man, I told you we shouldn't have shot Niedermeyer"
ISO is a kind of standard connector setup in vehicles in some Countries... but not in North America so you will have to cut the connector off and connect the wires directly to the vehicle's harness. The manual should list the independent wires so it shouldn't be an issue.