Re: 03 Silverado Radio "Theftlock" System
I'm pretty sure you have to enable theftlock before it will do anything to the radio. If it is enabled, you just have to enter your code at startup. I took the factory radio out and reinstalled it a couple times without any problems on my '02. I can't say for sure, but I think you will be alright.
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In the Garage: 
'02 Silverado Ext. Cab Z71 5.3l
'70 C20 Longstep 402BB
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