Because you are looking at different years (2002 v. 2004) it's a bit tougher to do the apple-to-apple comparison. In general, one is the same version of the other, just a different badget.
Here's where I would start looking in order to learn more about the options, pricing and also how people who have owned either vehicle rated them.
2004 GMC 1500 consumer reviews
http://www.edmunds.com/gmc/sierra1500/2004/consumerreview.html
2002 Silverado 1500 consumer reviews
http://www.edmunds.com/chevrolet/silverado1500/2002/consumerreview.html
On both of the above you can filter by the exact trim/style by selecting from the pulldown menu of "Read consumer reviews of a specific style"
Also, if you select the Ratings & Reviews tab you can choose to read the Edmunds' Editors Review and Rating of each truck.
Next I would run the appraisal numbers starting here http://www.edmunds.com/tmv/used/index.ht...
By following the steps it will give you what the private party price is for each truck based on mileage, condition, etc.
Source: http://www.edmunds.com/tmv/used/index.ht...
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