Hey there Stephane. I see where you posted about your heater blower noise. I moved that thread for you to the section that covers your truck (you have a 4th gen). Here is a link to that thread: http://www.ramforumz.com/showthread.php?t=128658. As for your other questions, this is your visitor message area, so unless someone comes to this page to leave you a message, they will not see your questions. You can post your 4wd question here and your radio question here. Good luck and if you need anything else, feel free to ask!