xonxoff,
You can retrofit a factory TNR in your 2004. 2004s have 2 different type amps, and the part number of TNR you need depends on which type amp your truck has installed.
The Bose amps were changed in mid 2004 to a lower grade model. 2003s have the "LUX" amp, just like the Cadillac Escalades. The later 2004s and the 2005s have the "premium" Bose system. You can tell the difference my the audio selections available on your radio. If your audio selections include "Normal, Driver, Rear, and Spacious" you have the "LUX" amp. If your selections include "Custom" you have the "premium" amp.
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