I'm going to assume that this is a late model Express van. The first thing to do is remove the knee bolster and bracket and drop the steering column, you can find this procedure in any repair manual. The next thing is there are a minimum of 7 friction clips that hold the dash panel in place, depending on the year there might be a few screws that will be visable, remove those and then simply grab the dash panel on one side and GENTLY pull on it, you will feel the clips release. The next is there will be a few wiring harness connected to the panel, release all the connectors and remove the panel. As for adding the new USB ports I would advise talking to a dealership and ask if the BCM (body control module) needs to be flashed (reprogramed) in order for the ports to be activated. I would do this step first.
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