| http://www.w3.org/ns/prov#value | - The 2004 and up radios are CAN BUS comunication protocol, including the 2008 your 2003 truck do not have this system so there is a good change that some of the functions are not going to work, the 2008 VSS output comes from the can bus, i did install a 2007 CD6 radio into a 2003 s series and it work just fine, the wiring is not that bad just buy 2 harness for the 2003 and 2008 radio side good luck
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