Ok i have a 2000 F-450, 7.3L with a six speed. It has 122k on it and i am looking to replace it. i want to go with a heaver truck, the 550 or 5500. i am a die hard ford man, but have dumped thousand into this truck and my last truck, 92 F-superduty 7.3L. I am considering the gmc, in fact i test drove one tonite. i like alot about it, but i dont like alot about it too. First the looks take alot to get use to. Also duramax seems to be a lot slower than the powerstroke, to me, but you get the allison trans. The gmc just look like a heavier truck than the ford. Then of course the 6.0 PS has been nothing but problems. Any way i was hoping to hear some pros and cons from everybody out there. Thanks for any input guys.