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Message: [QUOTE="gnxtc2, post: 1414479, member: 1414"] I have both....a OBS 7.3 and 6.7. The build up for the 7.3 is in the sig. The 6.7 is all stock. My observations from yearly trip from NJ to KY that I've done. Towing my goosneck trailer (over 21k). The 7.3 has the power to do it but can't beat the refine of the 6.7 to the 7.3. I set the cruise at 70. The 7.3 had to downshift to 3rd to pull some hills especially going through the mountains on the PA Turnpike. If I left it in OD, the EGTs would be too high. Same trip with the 6.7, truck not once had to downshift out of 6th. Plus...at the end of the trip, you were not beaten up. There is a difference between a OBS 7.3 and a SD 7.3. When I drive my buddies SD 7.3, it's so much smoother than the OBS 7.3. You gotta drive a SD to know what I'm talking about. Even my buddy said the same thing as he has both OBS and SD mason dumps with the 7.3. As much as I love my OBS 7.3, the 6.7 wins. Don't get me wrong, I still drive and tow with the 7.3 but 6.7 does it better. Billy T. [email]gnxtc2@aol.com[/email] [/QUOTE]

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