ive owned both and im currently runnin a 7.3 psd ...it seems to pull better and its more reliable ....just my opinion...guess it depends on what your gonna do with it..both good engines though:Thumbup:cmkworm said:I know this is prolly a biased place to ask but I'm looking for a truck. Seems the 6.0's have a lot of problems and are still very expensive. What are the major differences? Are the 7.3's still as efficient and powerful? Need some advice!!!