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Differences between IO3, IO4, 5, 6 Stereos?

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Hey everyone,


I recently purchased a 2015 Silverado WT. Its got the basic IO3 stereo in it and I was looking into options to give my truck more functionality. My truck has the small 4" screen, no cd player, it does have the usb, sd card, and aux ports in the center console but the stereo only recognizes the aux, not my flashdrive or sd cards. 


I was thinking, if I bought one of the other stereos like an IO4 and swapped it out, would that give me the ability to use SD and USD drives and even a backup camera if I can get one? Ive seen the 4" screens have the backup and more media options in other trucks. If I could just swap out the IO3 and get one of the others, I think that would be a simpler option to get my desired functions. I dont really care about bluetooth, nav, and satellite radio etc.  


I think IO5 and 6 are designed for the larger touchscreens correct? so they wouldn't really be compatible with my current screen. 

But would an IO4 be a safe and easy upgrade? Is there anything I should be concerned about when looking for other radios?  

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