I have done this conversion. In addition to the hardware that you need to "remove / replace" you will need to have the ecm reflashed by a gmc dealer or a shop able to do the same. The propane runs cooler, therefore the idle, engine operating temperature, transmission shifting is different. Look behind the seat in the door posts behind the plastic trim....byphase use to put the original fuel rails and injectors in the that position. This was in the "topkick" series from 1999-2003. I am not sure if they continued in the 2004-2010 series. Btw...schwains owns the by phase propane conversion company.
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