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2004 chevy trailblazer_ls_ext
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if it don't bolt right up you should be able to shave off the side bolt supports on that radio buy a DD dash kit and just slide into that and bolt it right up. Not 100% sure would wait for more thoughts from people with more wisdom but i think it would work.

before you order it make sure it comes with the wire harness from the HHR. It doesn't show it in the pic but you would want that so you could splice it in to the TB
 

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2004 chevy trailblazer_ls
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I own an HHR and I did an upgraded factory radio and I had to take it to the dealer to get it turned back on.

Or someone with a tech 2 scanner can get it working too.

Also it's best to have the VIN number off the vehicle it came out of.

In other words the BCM has to be reprogrammed to accept the new radio.

I don't think our TrailVoys have this,(reprogramming to accept new factory radio) so I don't believe it will work.
 
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