With either one you may have to remove that support bar because most aftermarket radios are deeper than the factory ones. If you can, there is usually a bolt hole in the back of the new radio to hook up the security bar to but it usually doesn't line up, reuse the bar to make it just a little harder to steal. You will probably have to do some bending of it, or i have seen some people on the forum make brackets.
The 2 choices I saw for my radio for the brackets were a universal and a factory specific. the universal ones usually come with interchangeable pieces to fit it to all kinds of cars, while the vehicle specific one bolted right to the front of the dash using the same holes as the factory retaining screws.
I got the vehicle specific, made it a lot easier for me. Mine is a 2002 if it helps you for comparison, but the 2 bolts holding the radio in are where it bolts up. I think the 03-06 TJ's had a 3 bolt design.
I used the 2nd one for mine. I was able to bend the bracket a little (while in place. I added a screw in the back sticking out......drilled a new hole in the bracket and once through it was very solid and the tension of the bracket will keep it in place during any rough jostling.....if you have small hands you can add a nut (my original plans but with the screw sticking through almost an inch and the tension from the bracket there really was no need for me.
Once you get in there you will figure it out.....pretty straightforward!!
I bought the JVC KD-X50BT for my Silverado and I really like it alot. No real issue with it. The remote is tiny, I think too small. But I never was going to use it anyhow so it doesn't matter much to me. I'm about to buy another one for my 2006 Jeep, glad to hear it fits. I'll load some pictures once I do.
This weekend I installed a Kenwood KIV-700 i picked up from a guy at work for $100. I got the wiring adapter and a installer toolkit from walmart for about $40. the deck is perfect for an iphone or ipod touch, it displays and functions just like the ipod screen. it also does Zune (who cares ) USB, Sirius, HD Radio (whatever that is), and has a regular aux input that I want to connect to my Cobra 75wxst through a headphone splitter. As for mounting, I was able to reuse the bezel and bracket from my old Sony deck. For 140 all-in it was a pretty good upgrade.
I never had a kenwood radio, but have some ancient kenwood 10"'s and amp in my silverado. The things sound awesome and hold up well. I only wish I didn't have to sell them with the truck just so I could sell the thing. I would put them in my TJ in a heartbeat if I could.
As for HD radio, if i read correctly, if a station broadcasts in HD the main difference is data like song/album/artist is also broadcast. An HD capable radio will display this, a non HD radio will just play the song and display the numbers of the station. I guess the audio signal quality may also be better but my ears can't tell the difference.
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