raindamier

Technically the 04's are 3.9's, but there is no performance difference. It's the same engine
Half of the 2004 engines are 3.8 and the other are 3.9. I guess halfway through the production year they switched over to the 3.9. The 3.9 will give you 1 mpg less on highway travel, 26 in auto as opposed to 27 in auto that the 3.8 gives. When you open your hood, look for the white sticker on top of your radiator fan, if it says v-6 then its prob a 3.9 liter, if it says 3.8, then its obviously a 3.8.

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