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<blockquote data-quote="aa21830" data-source="post: 679620" data-attributes="member: 558339">On the Blazer, it&#039;s unlikely that you&#039;ll need an antenna extension. I didn&#039;t when installing a Sony HU in my &#039;04 Blazer. I did have to slip a rubber o-ring over the outside of the antenna plug that goes in the back of the HU, because the plug fit kinda loose (needed to be a bit wider in diameter to keep it in there more securely). Might just be a Sony thing.I don&#039;t think you&#039;ll need to relocate the stock radio. From what I&#039;ve read, that seems to affect certain radios from trucks in the 2000-03 range (or thereabout). And even then, there&#039;s some debate about whether or not you actually need to keep the stock radio. GM had integrated some door chime and other electronic features through the radio (maybe OnStar, too...not sure) for a period of time but they don&#039;t do that now (at least not on my Blazer) and I don&#039;t think they were doing that in &#039;98.Can&#039;t help ya on the Grand Prix...sorry.</blockquote>

[QUOTE="aa21830, post: 679620, member: 558339"] On the Blazer, it's unlikely that you'll need an antenna extension. I didn't when installing a Sony HU in my '04 Blazer. I did have to slip a rubber o-ring over the outside of the antenna plug that goes in the back of the HU, because the plug fit kinda loose (needed to be a bit wider in diameter to keep it in there more securely). Might just be a Sony thing. I don't think you'll need to relocate the stock radio. From what I've read, that seems to affect certain radios from trucks in the 2000-03 range (or thereabout). And even then, there's some debate about whether or not you actually need to keep the stock radio. GM had integrated some door chime and other electronic features through the radio (maybe OnStar, too...not sure) for a period of time but they don't do that now (at least not on my Blazer) and I don't think they were doing that in '98. Can't help ya on the Grand Prix...sorry. [/QUOTE]

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