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East Central Indiana | I watched your video tonight. I'm on my third/fourth radio in an 8420. The original was a delco similar to yours, but with CD player.
Around 2006 I replaced it with a Pioneer DEH-xxxx with USB. I wanted to play MP3 from USB, but the the sound quality improvement was unexpected and substantial. Loudness control was really amazing, made me think the speakers had been replaced. There were several other sound settings with proprietary names. One or two were nice, the others were gimmicks. The problem with that Pioneer is that the display could not be read from below display level, and navigating a 16GB memory stick without being able to read the display was...difficult.
Next in 2012ish I replaced it with a Delphi HD CD USB radio, same as those that came in newer tractors. I was astounded by how much worse it sounded than the Pioneer, but at least I could read the display.
Then in 2020ish, not learning from the last Delphi mistake, I put a Bluetooth Delphi PP105226 (CD, AUX, USB, WB, XM, etc) in a peterbilt and was surprised how much worse it sounds than the stock radio, which was the SAME type of unit as the 2012 Delphi I put in the 8420. Also the display is unreadable because of the glossy reflections. But, the bluetooth works well and I don't listen to music anymore, just audio books. I believe multiple phones with this radio are possible. If it doesn't auto connect to my phone, it asks which phone to connect to. Pairing is pretty easy, just hold the phone button. I don't think it needed any passcodes. I paid about $160 new for it on ebay. That type of deal shows up many times a year, no need to pay the $300+MSRP. I've seen models that have no CD player, but they seem to cost the same either way.
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 (delphi cd (full).jpg)
 (delphi bt (full).jpg)
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 pioneer (full).jpg (21KB - 6 downloads)
delphi cd (full).jpg (13KB - 7 downloads)
delphi bt (full).jpg (17KB - 6 downloads)
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Replacement Radio for 8410T
