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Message: <blockquote data-quote="AuroraGirl" data-source="post: 22247" data-attributes="member: 9417">2003 in trucks marked a large change from 1.5 din size radios and non class 2 functionality. not sure if they used theftlock but if they did, it proabbly used a code instead of by VIN.  2002 in the H/C/G models (Aurora, Bonneville, Lesabre, Park Avenue) was the year that Theftlock II (The VIN kind) came to their already class 2 radios (since 97, 2000 depending on the model)Which means that 1997-2001 radios from these cars do not tie to the VIN, and they also are class 2.According to techlinked from like 2002 or 3, the radios for 2003+ trucks need to be configured when they are programmed with software to the vehicles setup (number of speakers, amps or not, cd changers, rear audio or not, etc) or there will be damage to the radioFrankly, i am willing to try out stuffing my 1998 park avenue loaded radio in and seeing what happens. im 70% certain the connectors are the same and they both "lock and dock" connect Thoughts? any experience?  I Want a cheap (free) upgrade to my literal base radio which only is AM/FM and nothing else</blockquote>