Replace Stock JBL head unit; what do I need to know?

I was considering replacing the stock JBL unit in my truck with a single DIN sized unit.

Can I keep the rest of the JBL setup Amp, sub, door speakers?

Can I salvage and re-purpose the stock XM antenna tuner?

Can I salvage and re-purpose the built in bluetooth?

Sorry if it's been asked 100 times. Just trying to understand what my options are.

 

You need this to retain your factory amp http://www.metraonline.com/part/TYTO-01

The new head unit will come with its own bluetooth mic.

Pretty sure you'll need a xm module and you might be able to plug in the oem xm antenna into it.

I would go with a double din, touchscreen or non touchscreen. It would look a lot better and you'll probably find it easier to use.

 

Thank you very much.